[DOCS] user mapping options list

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/sql-createusermapping.html
Description:

Hi,
Could you please also give the full list of options or at least link to on
the page?
Same favour to ask on "create server" command page.
The reason I ask - I keep forgetting which is it exactly user or username or
user_name for user mapping, table_name or table or tablename and schema or
so for foreign schema. Of course after trying several I hit the needed. But
It would be nice to have the exact and complete list in "\h create server"
and online reference..
Thank you