Update environment variables (#5192)

* Update environment variables

* Fix json snippet

* Fix text formats

Documentation/design-docs/multilevel-sharedfx-lookup.md

@@ -123,9 +123,9 @@ The runtimeconfig.json will have a new `frameworks` array section that allows mo
 			},
 			{
 					"name": "Microsoft.Forms",
-					"version": "3.0.0"
-					"rollForwardOnNoCandidateFx" : 1
-					"applyPatches" : true
+					"version": "3.0.0",
+					"rollForwardOnNoCandidateFx": 1,
+					"applyPatches": true
 			}
 	]
 }
@@ -222,9 +222,9 @@ In addition to searching the executable directory, the global .NET location is a
 
 Global .NET location:
 
-	Windows 32-bit: %SystemDrive%\Program Files\dotnet
-	Windows 64-bit (32-bit application): %SystemDrive%\Program Files (x86)\dotnet
-	Windows 64-bit (64-bit application): %SystemDrive%\Program Files\dotnet
+	Windows 32-bit: %ProgramFiles%\dotnet
+	Windows 64-bit (32-bit application): %ProgramFiles(x86)%\dotnet
+	Windows 64-bit (64-bit application): %ProgramFiles%\dotnet
 	Unix: none
 	OSX: none
 
@@ -239,12 +239,12 @@ Default installation location. In certain cases when a framework-dependent appho
 
 Using the specified version from the `--fx-version` argument or from the runtimeconfig.json file, the search is conducted as follows:
 
-	1.	Use the first of following locations to determine the most appropriate version:
+1.	Use the first of following locations to determine the most appropriate version:
  - If the muxer (e.g. dotnet.exe) use the directory of the muxer that is being executed.
  - For 2.1+, if the apphost (e.g. myapp.exe) use the environment variable %DOTNET_ROOT% (empty by default)
  - For 2.1+, if the apphost and %DOTNET_ROOT% is empty, use the `Default installation location`.
 
-	2.	Obtain the most appropriate version from the `Global .NET location` and compare it agaist the most appropriate version from the first step. Select the most appropriate version from the two locations. If a compatible framework cannot be found, then an error will be displayed.
+2.	Obtain the most appropriate version from the `Global .NET location` and compare it agaist the most appropriate version from the first step. Select the most appropriate version from the two locations. If a compatible framework cannot be found, then an error will be displayed.
 
 Determine the most appropriate version varies for release (production) and pre-release versions.
 - For releases: