Add a note in Windows-Bazel guide for MSVC version config (#3648)

It would be nice to detect which version of msvc someone has, but I'm
not going to try to figure out how to do that :-D
diff --git a/docs/get_started/getting_started_windows_bazel.md b/docs/get_started/getting_started_windows_bazel.md
index 689fc7a..23a54d1 100644
--- a/docs/get_started/getting_started_windows_bazel.md
+++ b/docs/get_started/getting_started_windows_bazel.md
@@ -69,6 +69,12 @@
 >     Editors and other programs can also clone the
 > repository, just make sure that they initialize the submodules.
 
+> Tip:<br>
+> &nbsp;&nbsp;&nbsp;&nbsp;configure_bazel.py only detects that you have Windows
+> and will output the default `--config=windows` to `configured.bazelrc`, which
+> assumes the latest version of MSVC. To avoid some warnings, you may want to
+> replace it with `--config=msvc2017`.
+
 ### Build
 
 Run all core tests: