The following documentation comment has been logged on the website:
Page: https://www.postgresql.org/docs/12/sql-createrole.html
Description:
From time to time some spelling for given command gets obsolete, yet it is
shown in the syntax on "equal rights" as other valid clauses. For instance
see `CREATE ROLE` with deprecated spellings like `IN GROUP` or `USER`. I
guess it would be useful to see those spellings visually marked as
deprecated in Synopsis section (with e.g. strike-through or whatever suits
better). Otherwise, when consulting documentation, it often requires jumping
from the synopsis to detailed description and back to check if given
spelling is still applicable. Just a thought. :-)