Doc: clarify description of regexp fields in pg_ident.conf.

The grammar was a little shaky and confusing here, so word-smith it
a bit.  Also, adjust the comments in pg_ident.conf.sample to use the
same terminology as the SGML docs, in particular "DATABASE-USERNAME"
not "PG-USERNAME".

Back-patch appropriate subsets.  I did not risk changing
pg_ident.conf.sample in released branches, but it still seems OK
to change it in v18.

Reported-by: Alexey Shishkin <alexey.shish...@enterprisedb.com>
Author: Tom Lane <t...@sss.pgh.pa.us>
Reviewed-by: David G. Johnston <david.g.johns...@gmail.com>
Discussion: 
https://postgr.es/m/175206279327.3157504.12519088928605422...@wrigleys.postgresql.org
Backpatch-through: 13

Branch
------
REL_18_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/f8ce5dea433c073369e8c4c4b8375ffd3a761509

Modified Files
--------------
doc/src/sgml/client-auth.sgml          | 16 ++++++++--------
src/backend/libpq/pg_ident.conf.sample | 26 +++++++++++++-------------
2 files changed, 21 insertions(+), 21 deletions(-)

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