Document that WAIT FOR LSN is timeline-blind

WAIT FOR LSN compares only the numeric LSN and has no notion of which
timeline a WAL record belongs to.  There are many possible scenarios when
timeline-switching can break read-your-writes consistency.  The proper
analysis and timeline support is possible in the next major release.  Yet
just document the current behaviour.

Reported-by: Xuneng Zhou <[email protected]>
Author: Alexander Korotkov <[email protected]>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/21d290161b11adc92a49da8e71fda69c20032618

Modified Files
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doc/src/sgml/ref/wait_for.sgml | 14 ++++++++++++++
1 file changed, 14 insertions(+)

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