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_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/2a5496f5a7fa5c80e900bd5b4e82a8efcc201573

Modified Files
--------------
doc/src/sgml/release-9.1.sgml | 9 +++++++--
doc/src/sgml/release-9.2.sgml | 9 +++++++--
2 files changed, 14 insertions(+), 4 deletions(-)

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