Add a link for the bazel.rc/.bazelrc format
Closes
@@ -86,7 +86,8 @@ misleading alias to point both targets to one guava library, then the BUILD file
## `.bazelrc`
-For project-specific options, use the configuration file `_your-workspace_/tools/bazel.rc`.
+For project-specific options, use the configuration file `_your-workspace_/tools/bazel.rc` (see
+[bazelrc format](https://docs.bazel.build/bazel-user-manual.html#bazelrc)).
For options that you **do not** want to check into source control, create the configuration file
`_your-workspace_/.bazelrc` and add `.bazelrc` to your `.gitignore`. Note that this file has a
