Thread: pgsql: Clean up win1252 documentation.

Log Message:
-----------
Clean up win1252 documentation.  Mention how we determine the number of
bytes/character for each encoding.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        charset.sgml (r2.69 -> r2.70)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/charset.sgml.diff?r1=2.69&r2=2.70)