doc: Clarify CHECKPOINT handling of unlogged buffers

The CHECKPOINT reference page still described checkpoints as flushing
all data files, which could be misleading as it depends on the value
of FLUSH_UNLOGGED option.  Update the description to make it clearer
that only data files of permanent relations are flushed by default.

Author: Chao Li <[email protected]>
Reviewed-by: Daniel Gustafsson <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/377cc45194f4f1bd6eb68bd6eb42402e46e326d7

Modified Files
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doc/src/sgml/ref/checkpoint.sgml | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

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