pgsql: Update documentation about pseudo-types.

Update documentation about pseudo-types.

Tone down an overly strong statement about which pseudo-types PLs are
likely to allow. Add "event_trigger" to the list, as well as
"pg_ddl_command" in 9.5/HEAD. Back-patch to 9.3 where event_trigger
was added.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/731dfc7d5f07fac2c3c72f47c29a947e363acee9

Modified Files
--------------
doc/src/sgml/datatype.sgml | 27 +++++++++++++++++++++++----
1 file changed, 23 insertions(+), 4 deletions(-)

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