Simplify CODEOWNERS (#13679)

.github/CODEOWNERS

 # Learn how to add code owners here:
 # https://help.github.com/en/articles/about-code-owners
 
-*                         @Timer
-/packages/                @timneutkens @Timer @ijjk @lfades
-/examples/                @lfades @Timer
-/test/                    @timneutkens @Timer @ijjk @lfades
-/bench/                   @timneutkens @Timer
-/errors/                  @Timer
+*          @timneutkens @Timer @ijjk @lfades
+/docs/     @timneutkens @Timer @ijjk @lfades @chibicode
+/examples/ @timneutkens @Timer @ijjk @lfades @chibicode