chrome-support: update sandbox disabling instructions (#107)

The XRSandbox feature was removed several years ago[1][2], so these
instructions to be able to use OpenXR runtimes that don't support the
XR_EXT_win32_appcontainer_compatible extension have not been working.
Replace with --no-sandbox since that is now the only way to do this.

[1] https://chromium.googlesource.com/chromium/src/+/f2935f81d3ba2839ac4ec8eebae6a80872e4c2ba
[2] https://chromium-review.googlesource.com/c/chromium/src/+/3905866

Author: gregoryT5

chrome-support.html

@@ -115,9 +115,9 @@ <h2 id='getting-openxr-win'>
 			<b>Unsandboxed OpenXR</b>
 			<br/><br/>
 			To test Chrome with OpenXR runtimes that do not implement the <i>XR_EXT_win32_appcontainer_compatible</i> extension, WebXR sandboxing must be disabled.<br/><br/>
-			<b>It is not recommended that you use Chrome with the following flags for daily browsing, as it disables certain security measures around Chrome interaction with VR hardware!</b><br/><br/>
-			To disable Chrome's WebXR sandboxing, use the following command line option:
-			<pre>--disable-features=XRSandbox</pre>
+			<b>It is not recommended that you use Chrome with the following flags for daily browsing, as it disables many Chrome security measures!</b><br/><br/>
+			To disable Chrome's sandboxing (including WebXR sandboxing), use the following command line option:
+			<pre>--no-sandbox</pre>
 		</p>
 
     <h2 id='getting-openxr-android'>