pgsql: docs: correct 9.1 and 9.2 release note mention of timeline switc

docs: correct 9.1 and 9.2 release note mention of timeline switch fix

Backpatch through 9.1.

KONDO Mitsumasa

Branch
------
REL9_1_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/38ee3c55a7403d3c33a28a61b63e94590515912b

Modified Files
--------------
doc/src/sgml/release-9.1.sgml | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)

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