Merge branch 'la/doc-interpret-trailers'

Doc update. * la/doc-interpret-trailers: doc: trailer: add more examples in DESCRIPTION doc: trailer: mention 'key' in DESCRIPTION doc: trailer.<token>.command: emphasize deprecation doc: trailer: use angle brackets for <token> and <value> doc: trailer: remove redundant phrasing doc: trailer: examples: avoid the word "message" by itself doc: trailer: drop "commit message part" phrasing doc: trailer: swap verb order doc: trailer: fix grammar