pgsql: Mark postgresql.conf entries that require server restart; some

Log Message:
-----------
Mark postgresql.conf entries that require server restart; some minor
editing and reformatting.

Modified Files:
--------------
pgsql/src/backend/utils/misc:
postgresql.conf.sample (r1.182 -> r1.183)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample.diff?r1=1.182&r2=1.183)