Fix markdown formatting issues in docs

_OS: fix broken admonition
linkerfatalwarnings: fix broken table, clarify wording.
os.is: fix broken link
profile: fix broken table

Author: thomashope

website/docs/globals/premake_OS.md

@@ -2,7 +2,7 @@
 id: _OS
 ---
 
-:::caution_
+:::caution
 **This has been deprecated in Premake 5.0 alpha 12.** Use the new [_TARGET_OS](premake_TARGET_OS.md) instead.
 :::
 

website/docs/linkerfatalwarnings.md

@@ -10,11 +10,11 @@ linkerfatalwarnings { "warnings" }
 
 For Visual Studio, the MSC warning number should be used to specify the warning. On other compilers, the warning should be identified by name.
 
-In addition, Premake provides a special value to turn on all linker warnings.
+In addition, Premake provides the special value `All` to turn on all linker warnings.
 
-| Value   | Description                   |
--------------------------------------------
-| All | Treat all linker warnings as errors   |
+| Value | Description                         |
+|-------|-------------------------------------|
+| All   | Treat all linker warnings as errors |
 
 ### Applies To ###
 

website/docs/os/os.is.md

@@ -1,5 +1,5 @@
 :::caution
-**This function has been deprecated.** Use [os.istarget()](os.istarget.md), os.target()](os.target.md), or [os.host()](os.host.md) instead.
+**This function has been deprecated.** Use [os.istarget()](os.istarget.md), [os.target()](os.target.md), or [os.host()](os.host.md) instead.
 :::
 
 Checks the current operating system identifier against a particular value.

website/docs/profile.md

@@ -5,10 +5,11 @@ profile "value"
 ```
 
 ### Parameters ###
-| Value   | Description                                                             |
--------------------------------------------------------------------------------------
-| On      | Turn on instrumented performance profiling.                             |
-| Off     | Turn off instrumented performance profiling.                            |
+
+| Value   | Description                                  |
+|---------|----------------------------------------------|
+| On      | Turn on instrumented performance profiling.  |
+| Off     | Turn off instrumented performance profiling. |
 
 ### Applies To ###