pgsql: Minor improvements for CHECK NO INHERIT documentation.

Minor improvements for CHECK NO INHERIT documentation.

Fix typo spotted by Thom Brown, and improve wording in another area
where Thom spotted a typo.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/9d435d57e1f8ec7e51d40722854252875d8cc6eb

Modified Files
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doc/src/sgml/ref/alter_table.sgml  |    5 ++---
doc/src/sgml/ref/create_table.sgml |    2 +-
2 files changed, 3 insertions(+), 4 deletions(-)