Update Change Waves env var in docs (#7909)

Author: AR-May

documentation/wiki/ChangeWaves-Dev.md

@@ -7,7 +7,7 @@ A Change Wave is a set of risky features developed under the same opt-out flag.
 Opt-out is a better approach for us because we'd likely get limited feedback when a feature impacts customer builds. When a feature does impact a customer negatively, it's a quick switch to disable and allows time to adapt. The key aspect to Change Waves is that it smooths the transition for customers adapting to risky changes that the MSBuild team feels strongly enough to take.
 
 ## How do They Work?
-The opt-out comes in the form of setting the environment variable `MSBuildDisableFeaturesFromVersion` to the Change Wave (or version) that contains the feature you want **disabled**. This version happens to be the version of MSBuild that the features were developed for. See the mapping of change waves to features below.
+The opt-out comes in the form of setting the environment variable `MSBUILDDISABLEFEATURESFROMVERSION` to the Change Wave (or version) that contains the feature you want **disabled**. This version happens to be the version of MSBuild that the features were developed for. See the mapping of change waves to features below.
 
 ## Choosing a Change Wave for a New Feature
 This is determined on a case by case basis and should be discussed with the MSBuild team. A safe bet would be to check our [currently active Change Waves](ChangeWaves.md#change-waves-&-associated-features) and pick the version after the latest MSBuild version. This version corresponds to the latest version of Visual Studio.
@@ -56,7 +56,7 @@ If you need to condition a Task or Target, use the built in `AreFeaturesEnabled`
 ```
 
 ## Test Your Feature
-Create tests as you normally would. Include one test with environment variable `MSBuildDisableFeaturesFromVersion` set to `ChangeWaves.Wave17_4`. Set this like so:
+Create tests as you normally would. Include one test with environment variable `MSBUILDDISABLEFEATURESFROMVERSION` set to `ChangeWaves.Wave17_4`. Set this like so:
 ```c#
 using TestEnvironment env = TestEnvironment.Create();
 

documentation/wiki/ChangeWaves.md

@@ -5,13 +5,13 @@ A Change Wave is a set of risky features developed under the same opt-out flag.
 Opt-out is a better approach for us because we'd likely get limited feedback when a feature impacts customer builds. When a feature does impact a customer negatively, it's a quick switch to disable and allows time to adapt. The key aspect to Change Waves is that it smooths the transition for customers adapting to risky changes that the MSBuild team feels strongly enough to take.
 
 ## How do they work?
-The opt-out comes in the form of setting the environment variable `MSBuildDisableFeaturesFromVersion` to the Change Wave (or version) that contains the feature you want **disabled**. This version happens to be the version of MSBuild that the features were developed for. See the mapping of change waves to features below.
+The opt-out comes in the form of setting the environment variable `MSBUILDDISABLEFEATURESFROMVERSION` to the Change Wave (or version) that contains the feature you want **disabled**. This version happens to be the version of MSBuild that the features were developed for. See the mapping of change waves to features below.
 
 ## When do they become permanent?
 A wave of features is set to "rotate out" (i.e. become standard functionality) two bands after its release. For example, wave 16.8 stayed opt-out through wave 16.10, becoming standard functionality when wave 17.0 is introduced.
 
-## MSBuildDisableFeaturesFromVersion Values & Outcomes
-| `MSBuildDisableFeaturesFromVersion` Value                         | Result        | Receive Warning? |
+## MSBUILDDISABLEFEATURESFROMVERSION Values & Outcomes
+| `MSBUILDDISABLEFEATURESFROMVERSION` Value                         | Result        | Receive Warning? |
 | :-------------                                                    | :----------   | :----------: |
 | Unset                                                             | All Change Waves will be enabled, meaning all features behind each Change Wave will be enabled.               | No   |
 | Any valid & current Change Wave (Ex: `16.8`)                      | All features behind Change Wave `16.8` and higher will be disabled.                                           | No   |

src/Build.UnitTests/ChangeWaves_Tests.cs

@@ -24,7 +24,7 @@ public ChangeWaves_Tests(ITestOutputHelper output)
         }
 
         /// <summary>
-        /// Performs necessary operations for setting the MSBuildDisableFeaturesFromVersion environment variable.
+        /// Performs necessary operations for setting the MSBUILDDISABLEFEATURESFROMVERSION environment variable.
         /// This is required because Change Waves is static and stale values can be seen between tests in the same assembly.
         /// </summary>
         /// <param name="wave">The version to set as the current Change Wave.</param>
@@ -41,7 +41,7 @@ private void SetChangeWave(string wave, TestEnvironment env)
         /// </summary>
         /// <param name="testEnvironment">The TestEnvironment being used for this test.</param>
         /// <param name="versionToCheckAgainstCurrentChangeWave">The version to compare to the current set Change Wave.</param>
-        /// <param name="currentChangeWaveShouldUltimatelyResolveTo">What the project property for the environment variable MSBuildDisableFeaturesFromVersion ultimately resolves to.</param>
+        /// <param name="currentChangeWaveShouldUltimatelyResolveTo">What the project property for the environment variable MSBUILDDISABLEFEATURESFROMVERSION ultimately resolves to.</param>
         /// <param name="warningCodesLogShouldContain">An array of warning codes that should exist in the resulting log. Ex: "MSB4271".</param>
         private void buildSimpleProjectAndValidateChangeWave(TestEnvironment testEnvironment, Version versionToCheckAgainstCurrentChangeWave, Version currentChangeWaveShouldUltimatelyResolveTo, params string[] warningCodesLogShouldContain)
         {

src/Build/Resources/Strings.resx

@@ -322,11 +322,11 @@
     </comment>
   </data>
   <data name="ChangeWave_InvalidFormat" xml:space="preserve">
-    <value>MSB4271: Environment variable MSBuildDisableFeaturesFromVersion is set to an invalid format. Enabling all change wave versions. Entered value: {0}. Current Change Waves: {1}.</value>
+    <value>MSB4271: Environment variable MSBUILDDISABLEFEATURESFROMVERSION is set to an invalid format. Enabling all change wave versions. Entered value: {0}. Current Change Waves: {1}.</value>
     <comment>{StrBegin="MSB4271: "}UE: Value should be of the format: xx.yy</comment>
   </data>
   <data name="ChangeWave_OutOfRotation" xml:space="preserve">
-    <value>MSB4272: Environment variable MSBuildDisableFeaturesFromVersion is set to a version that is out of rotation. Defaulting to Change Wave version: {0}. Entered value: {1}. Current Change Waves: {2}.</value>
+    <value>MSB4272: Environment variable MSBUILDDISABLEFEATURESFROMVERSION is set to a version that is out of rotation. Defaulting to Change Wave version: {0}. Entered value: {1}. Current Change Waves: {2}.</value>
     <comment>{StrBegin="MSB4272: "}</comment>
   </data>
   <data name="SearchPathsForMSBuildExtensionsPath" xml:space="preserve">