Add comments in templates and update component guide

Editor assessment

The subject states the dual change: comments were added in templates and the component guide was updated. Both artifacts are named, so the reader knows what was touched. The chore type fits documentation-adjacent maintenance. No scope is present, though the templates area is implied. There is no body, acceptable for a small twin change whose headline enumerates both parts; the content of the comments is inherently self-explanatory. No footers appear. The lowercase imperative phrasing is clean and the message is self-sufficient for its size.