Update documentation

Author: NikolaMilosavljevic

Documentation/ArcadeSdk.md

@@ -1043,6 +1043,9 @@ If set to `true` the GetResourceString method is not included in the generated c
 #### `FlagNetStandard1XDependencies` (bool)
 If set to `true` the `FlagNetStandard1xDependencies` target validates that the dependency graph doesn't contain any netstandard1.x packages.
 
+#### `_OverrideArcadeInitializeBuildToolFramework` (string)
+If this environment variable is set, the value will be used to override the default Build Tools Framework version.
+
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