message: Remove mention of MSVC support from docs
  Since MSVC bots has been removed, we can't say that MSVC is supported.
  Cr-Commit-Position: refs/heads/main@{#36726}
diff: @@ -29,8 +29,6 @@ See also
  [here](https://source.chromium.org/chromium/chromium/src/+/main:docs/clang.md)
  for some clang related documentation from Chromium.
  -MSVC is also supported at version VS 2019 16.61.
  -
  Other compilers are not officially supported (which means there is no CI
  coverage for them) but patches to keep WebRTC working with them are welcomed by
  the WebRTC Team.
  