Set information_schema.tables.commit_action to null

The commit action of temporary tables is currently not cataloged, so
we can't easily show it.  The previous value was outdated from before
we had different commit actions.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/bf3c5856818a88b963748402f4f7e0274fe3859d

Modified Files
--------------
doc/src/sgml/information_schema.sgml       |    7 +------
src/backend/catalog/information_schema.sql |    5 +----
2 files changed, 2 insertions(+), 10 deletions(-)

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