Add a documentation example for code owners rules with **

doc/user/project/code_owners.md

@@ -254,6 +254,11 @@ README @group @group/with-nested/subgroup
 # `docs/index.md` but not `docs/projects/index.md`:
 /docs/* @root-docs
 
+# Include `/**` to specify Code Owners for all subdirectories
+# in a directory. This rule matches `docs/projects/index.md` or 
+# `docs/development/index.md`
+/docs/**/*.md @root-docs
+
 # This code makes matches a `lib` directory nested anywhere in the repository:
 lib/ @lib-owner