pgsql: Fix misc typos.

Fix misc typos.

Oskari Saarenmaa. Backpatch to stable branches where applicable.

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/29602295bacf6e1e59abd6b82734f51d9c107ba8

Modified Files
--------------
contrib/btree_gist/btree_ts.c         |    2 +-
contrib/btree_gist/btree_utils_var.c  |    2 +-
contrib/cube/cube.c                   |    2 +-
doc/src/sgml/sources.sgml             |    2 +-
src/backend/access/common/heaptuple.c |    2 +-
src/backend/access/gin/ginfast.c      |    4 ++--
src/backend/access/gist/gistproc.c    |    4 ++--
src/backend/access/heap/heapam.c      |    4 ++--
src/backend/access/heap/rewriteheap.c |    4 ++--
src/backend/optimizer/path/costsize.c |    2 +-
src/backend/utils/adt/regproc.c       |    2 +-
11 files changed, 15 insertions(+), 15 deletions(-)