doc: Clarify OAuth validator authn_id logging

Document that OAuth validators can return an authenticated identity
in the authn_id member.  The server records the identity value before
checking if the connection is authorized, so it may appear in
connection-authentication logs (even if the connection later fails
authorization).

Also remove outdated wording saying that all result parameters are
ignored when a validator returns false since validators may provide
error_detail.

Patch by Chao Li with some additional wordsmithing by me.

Author: Chao Li <[email protected]>
Reviewed-by: Jacob Champion <[email protected]>
Reported-by: Daniel Gustafsson <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/4cb2e2fe0aa8251bef8c2e2351cd5a062c105c0a

Modified Files
--------------
doc/src/sgml/oauth-validators.sgml | 13 +++++++++----
1 file changed, 9 insertions(+), 4 deletions(-)

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