pgsql: Shorten warning about hash creation

Shorten warning about hash creation

Also document that PITR is also affected.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/b87671f1b63a0c9cf264afc209e3acebdb52477f

Modified Files
--------------
doc/src/sgml/ref/create_index.sgml             |    3 ++-
src/backend/commands/indexcmds.c               |    2 +-
src/test/regress/expected/create_index.out     |    8 ++++----
src/test/regress/expected/enum.out             |    2 +-
src/test/regress/expected/macaddr.out          |    2 +-
src/test/regress/expected/replica_identity.out |    2 +-
src/test/regress/expected/uuid.out             |    2 +-
7 files changed, 11 insertions(+), 10 deletions(-)