pgsql: Update messages, comments and documentation for materialized vie

Update messages, comments and documentation for materialized views.

All instances of the verbiage lagging the code.  Back-patch to 9.3,
where materialized views were introduced.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/02d2b694ee42a9e241d37ce67df122fff43d5bb9

Modified Files
--------------
doc/src/sgml/maintenance.sgml                   |    2 +-
src/backend/access/heap/tuptoaster.c            |    4 ++--
src/backend/catalog/aclchk.c                    |    1 -
src/backend/catalog/heap.c                      |    5 ++---
src/backend/commands/comment.c                  |    2 +-
src/backend/commands/indexcmds.c                |    6 +++---
src/backend/commands/seclabel.c                 |    2 +-
src/backend/commands/tablecmds.c                |    2 +-
src/backend/commands/typecmds.c                 |    9 ++++++++-
src/backend/commands/vacuum.c                   |    6 +++---
src/backend/parser/parse_utilcmd.c              |    2 +-
src/backend/rewrite/rewriteDefine.c             |    2 ++
src/bin/pg_dump/common.c                        |    4 ++--
src/pl/tcl/pltcl.c                              |    2 +-
src/test/regress/expected/create_table_like.out |    2 +-
15 files changed, 29 insertions(+), 22 deletions(-)