pgsql: doc: Various typo/grammar fixes

doc: Various typo/grammar fixes

Errors detected using Topy (https://github.com/intgr/topy), all
changes verified by hand and some manual tweaks added.

Marti Raudsepp

Individual changes backpatched, where applicable, as far as 9.0.

Branch
------
REL9_2_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/9c4b7ed13da24cdb2f977547546bb6be437d1974

Modified Files
--------------
doc/src/sgml/datatype.sgml               |    2 +-
doc/src/sgml/mvcc.sgml                   |    2 +-
doc/src/sgml/pgbench.sgml                |    2 +-
doc/src/sgml/pgcrypto.sgml               |    2 +-
doc/src/sgml/pltcl.sgml                  |    2 +-
doc/src/sgml/queries.sgml                |    2 +-
doc/src/sgml/ref/alter_tsdictionary.sgml |    2 +-
doc/src/sgml/ref/comment.sgml            |    2 +-
doc/src/sgml/release-7.4.sgml            |    2 +-
doc/src/sgml/release-8.2.sgml            |    2 +-
doc/src/sgml/release-old.sgml            |    6 +++---
doc/src/sgml/stylesheet.dsl              |    2 +-
doc/src/sgml/textsearch.sgml             |    2 +-
doc/src/sgml/xml2.sgml                   |    2 +-
doc/src/sgml/xoper.sgml                  |    2 +-
15 files changed, 17 insertions(+), 17 deletions(-)