Documentation issue: Command-Line Reference

Documentation URL: https://docs.bazel.build/versions/master/command-line-reference.html

The entry for --workspace_status_command says: A command invoked at the beginning of the build to provide status information about the workspace in the form of key/value pairs. See the User's Manual for the full specification. Also see tools/buildstamp/get_workspace_status for an example.

Two problems:

1. the example is not explaining how it interacts with --workspace_status_command
2. This "manual", what is it? It's definitely not https://docs.bazel.build/versions/4.0.0/command-line-reference.html, and there is no other "manual" anywhere else in the docs.bazel.build hierarchy!