pgsql: Backpatch some blatant spelling mistakes

Log Message:
-----------
Backpatch some blatant spelling mistakes

Tags:
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REL8_4_STABLE

Modified Files:
--------------
    pgsql/doc/src/sgml:
        docguide.sgml (r1.76 -> r1.76.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/docguide.sgml?r1=1.76&r2=1.76.2.1)
        earthdistance.sgml (r1.3 -> r1.3.4.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/earthdistance.sgml?r1=1.3&r2=1.3.4.1)
        pgstandby.sgml (r2.10 -> r2.10.2.1)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/pgstandby.sgml?r1=2.10&r2=2.10.2.1)
    pgsql/doc/src/sgml/ref:
        psql-ref.sgml (r1.225.2.4 -> r1.225.2.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/psql-ref.sgml?r1=1.225.2.4&r2=1.225.2.5)