pgsql: More minor updates and copy-editing.

Log Message:
-----------
More minor updates and copy-editing.

Modified Files:
--------------
pgsql/doc/src/sgml/ref:
ipcclean.sgml (r1.10 -> r1.11)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/ipcclean.sgml.diff?r1=1.10&r2=1.11)
pg_config-ref.sgml (r1.18 -> r1.19)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_config-ref.sgml.diff?r1=1.18&r2=1.19)
pg_dump.sgml (r1.74 -> r1.75)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_dump.sgml.diff?r1=1.74&r2=1.75)
pg_dumpall.sgml (r1.46 -> r1.47)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_dumpall.sgml.diff?r1=1.46&r2=1.47)
pg_restore.sgml (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/pg_restore.sgml.diff?r1=1.48&r2=1.49)
psql-ref.sgml (r1.126 -> r1.127)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml.diff?r1=1.126&r2=1.127)
select.sgml (r1.78 -> r1.79)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/select.sgml.diff?r1=1.78&r2=1.79)
select_into.sgml (r1.31 -> r1.32)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/select_into.sgml.diff?r1=1.31&r2=1.32)
show.sgml (r1.36 -> r1.37)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/show.sgml.diff?r1=1.36&r2=1.37)
update.sgml (r1.30 -> r1.31)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/update.sgml.diff?r1=1.30&r2=1.31)