pgsql: More < and > cleanups converted to ampersands.

Log Message:
-----------
More < and > cleanups converted to ampersands.

Modified Files:
--------------
pgsql/doc/src/sgml:
backup.sgml (r2.54 -> r2.55)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml.diff?r1=2.54&r2=2.55)
datatype.sgml (r1.154 -> r1.155)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datatype.sgml.diff?r1=1.154&r2=1.155)
ddl.sgml (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ddl.sgml.diff?r1=1.38&r2=1.39)
dfunc.sgml (r1.28 -> r1.29)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/dfunc.sgml.diff?r1=1.28&r2=1.29)
dml.sgml (r1.9 -> r1.10)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/dml.sgml.diff?r1=1.9&r2=1.10)
ecpg.sgml (r1.62 -> r1.63)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ecpg.sgml.diff?r1=1.62&r2=1.63)
func.sgml (r1.234 -> r1.235)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.234&r2=1.235)
geqo.sgml (r1.27 -> r1.28)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/geqo.sgml.diff?r1=1.27&r2=1.28)
indices.sgml (r1.49 -> r1.50)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/indices.sgml.diff?r1=1.49&r2=1.50)
plpgsql.sgml (r1.57 -> r1.58)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.57&r2=1.58)
pltcl.sgml (r2.33 -> r2.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pltcl.sgml.diff?r1=2.33&r2=2.34)
queries.sgml (r1.32 -> r1.33)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/queries.sgml.diff?r1=1.32&r2=1.33)
query.sgml (r1.42 -> r1.43)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/query.sgml.diff?r1=1.42&r2=1.43)
release.sgml (r1.322 -> r1.323)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/release.sgml.diff?r1=1.322&r2=1.323)
rowtypes.sgml (r2.4 -> r2.5)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/rowtypes.sgml.diff?r1=2.4&r2=2.5)
rules.sgml (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/rules.sgml.diff?r1=1.38&r2=1.39)
runtime.sgml (r1.301 -> r1.302)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/runtime.sgml.diff?r1=1.301&r2=1.302)
spi.sgml (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/spi.sgml.diff?r1=1.38&r2=1.39)
sql.sgml (r1.33 -> r1.34)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sql.sgml.diff?r1=1.33&r2=1.34)
trigger.sgml (r1.40 -> r1.41)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/trigger.sgml.diff?r1=1.40&r2=1.41)
xaggr.sgml (r1.25 -> r1.26)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xaggr.sgml.diff?r1=1.25&r2=1.26)
xfunc.sgml (r1.97 -> r1.98)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.97&r2=1.98)