pgsql: Replace "--" and "---" with "—" as appropriate, for

Log Message:
-----------
Replace "--" and "---" with "—" as appropriate, for better-looking
output.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        advanced.sgml (r1.45 -> r1.46)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/advanced.sgml.diff?r1=1.45&r2=1.46)
        array.sgml (r1.38 -> r1.39)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/array.sgml.diff?r1=1.38&r2=1.39)
        backup.sgml (r2.50 -> r2.51)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/backup.sgml.diff?r1=2.50&r2=2.51)
        catalogs.sgml (r2.91 -> r2.92)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/catalogs.sgml.diff?r1=2.91&r2=2.92)
        charset.sgml (r2.45 -> r2.46)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/charset.sgml.diff?r1=2.45&r2=2.46)
        client-auth.sgml (r1.67 -> r1.68)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/client-auth.sgml.diff?r1=1.67&r2=1.68)
        datetime.sgml (r2.42 -> r2.43)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/datetime.sgml.diff?r1=2.42&r2=2.43)
        ddl.sgml (r1.31 -> r1.32)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ddl.sgml.diff?r1=1.31&r2=1.32)
        dfunc.sgml (r1.27 -> r1.28)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/dfunc.sgml.diff?r1=1.27&r2=1.28)
        docguide.sgml (r1.50 -> r1.51)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/docguide.sgml.diff?r1=1.50&r2=1.51)
        errcodes.sgml (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/errcodes.sgml.diff?r1=1.9&r2=1.10)
        func.sgml (r1.222 -> r1.223)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.222&r2=1.223)
        information_schema.sgml (r1.17 -> r1.18)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/information_schema.sgml.diff?r1=1.17&r2=1.18)
        libpq.sgml (r1.167 -> r1.168)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/libpq.sgml.diff?r1=1.167&r2=1.168)
        maintenance.sgml (r1.37 -> r1.38)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/maintenance.sgml.diff?r1=1.37&r2=1.38)
        mvcc.sgml (r2.44 -> r2.45)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/mvcc.sgml.diff?r1=2.44&r2=2.45)
        nls.sgml (r1.9 -> r1.10)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/nls.sgml.diff?r1=1.9&r2=1.10)
        perform.sgml (r1.46 -> r1.47)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/perform.sgml.diff?r1=1.46&r2=1.47)
        plpgsql.sgml (r1.48 -> r1.49)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/plpgsql.sgml.diff?r1=1.48&r2=1.49)
        protocol.sgml (r1.54 -> r1.55)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/protocol.sgml.diff?r1=1.54&r2=1.55)
        queries.sgml (r1.30 -> r1.31)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/queries.sgml.diff?r1=1.30&r2=1.31)
        query.sgml (r1.39 -> r1.40)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/query.sgml.diff?r1=1.39&r2=1.40)
        regress.sgml (r1.41 -> r1.42)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/regress.sgml.diff?r1=1.41&r2=1.42)
        rules.sgml (r1.35 -> r1.36)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/rules.sgml.diff?r1=1.35&r2=1.36)
        sources.sgml (r2.14 -> r2.15)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sources.sgml.diff?r1=2.14&r2=2.15)
        sql.sgml (r1.32 -> r1.33)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/sql.sgml.diff?r1=1.32&r2=1.33)
        syntax.sgml (r1.96 -> r1.97)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/syntax.sgml.diff?r1=1.96&r2=1.97)
        wal.sgml (r1.30 -> r1.31)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/wal.sgml.diff?r1=1.30&r2=1.31)
        xaggr.sgml (r1.24 -> r1.25)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xaggr.sgml.diff?r1=1.24&r2=1.25)
        xfunc.sgml (r1.88 -> r1.89)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xfunc.sgml.diff?r1=1.88&r2=1.89)
        xindex.sgml (r1.36 -> r1.37)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xindex.sgml.diff?r1=1.36&r2=1.37)
        xoper.sgml (r1.31 -> r1.32)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/xoper.sgml.diff?r1=1.31&r2=1.32)
    pgsql/doc/src/sgml/ref:
        cluster.sgml (r1.33 -> r1.34)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/cluster.sgml.diff?r1=1.33&r2=1.34)
        copy.sgml (r1.57 -> r1.58)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/copy.sgml.diff?r1=1.57&r2=1.58)
        declare.sgml (r1.31 -> r1.32)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/declare.sgml.diff?r1=1.31&r2=1.32)
        lock.sgml (r1.43 -> r1.44)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/lock.sgml.diff?r1=1.43&r2=1.44)
        postgres-ref.sgml (r1.44 -> r1.45)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/ref/postgres-ref.sgml.diff?r1=1.44&r2=1.45)