pgsql: Some more small improvements in response to 7.4 interactive docs

Log Message:
-----------
Some more small improvements in response to 7.4 interactive docs comments.

Modified Files:
--------------
pgsql/doc/src/sgml:
ecpg.sgml (r1.61 -> r1.62)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ecpg.sgml.diff?r1=1.61&r2=1.62)
gist.sgml (r1.14 -> r1.15)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/gist.sgml.diff?r1=1.14&r2=1.15)
indices.sgml (r1.48 -> r1.49)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/indices.sgml.diff?r1=1.48&r2=1.49)
installation.sgml (r1.224 -> r1.225)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/installation.sgml.diff?r1=1.224&r2=1.225)
libpq.sgml (r1.176 -> r1.177)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml.diff?r1=1.176&r2=1.177)
lobj.sgml (r1.34 -> r1.35)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/lobj.sgml.diff?r1=1.34&r2=1.35)
manage-ag.sgml (r2.39 -> r2.40)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/manage-ag.sgml.diff?r1=2.39&r2=2.40)
plpgsql.sgml (r1.54 -> r1.55)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.54&r2=1.55)
runtime.sgml (r1.300 -> r1.301)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml.diff?r1=1.300&r2=1.301)
user-manag.sgml (r1.26 -> r1.27)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/user-manag.sgml.diff?r1=1.26&r2=1.27)
xfunc.sgml (r1.94 -> r1.95)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.94&r2=1.95)
xtypes.sgml (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xtypes.sgml.diff?r1=1.23&r2=1.24)