clarify that toolset = MSVC toolset

Author: davidmrdavid

docs/overview/compiler-versions.md

@@ -79,9 +79,9 @@ When the major version changed between Visual Studio 2013 and Visual Studio 2015
 
 An example of a minor change is from Visual Studio 2022 17.1 to Visual Studio 2022 17.2. In that case, `_MSC_VER` changed from 1931 to 1932.
 
-The following table lists the Visual C++ compiler `_MSC_VER` for each corresponding Visual Studio and toolset release:
+The following table lists the Visual C++ compiler `_MSC_VER` for each corresponding Visual Studio and MSVC toolset release:
 
-| Visual Studio version | `_MSC_VER` | Toolset version |
+| Visual Studio version | `_MSC_VER` | MSVC toolset version |
 |--|--|--|
 | Visual Studio 6.0 | 1200 | 6.0 |
 | Visual Studio .NET 2002 (7.0) | 1300 | 7.0 |