Log Message:
-----------
Document aliases for our supported encodings.

Add a few encodings that were not documented.

Modified Files:
--------------
pgsql/doc/src/sgml:
charset.sgml (r2.50 -> r2.51)
(http://developer.postgresql.org/cvsw...1=2.50&r2=2.51)
pgsql/src/backend/utils/mb:
encnames.c (r1.23 -> r1.24)
(http://developer.postgresql.org/cvsw...1=1.23&r2=1.24)

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