doc: Clarify the logging collector's guarantees.

Presently, the documentation for logging_collector says that the
collector "is designed to never lose messages," which reads as a
stronger promise than we actually make.  The collector does not
fsync the log file or retry failed writes, so log messages can go
missing after an operating system crash, power loss, or a write
error.  Reword that sentence and add a note about what is not
guaranteed.

Author: Daniel Bauman <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Reviewed-by: Zhenwei Shang <[email protected]>
Reviewed-by: Robert Treat <[email protected]>
Discussion: 
https://postgr.es/m/CAMtj0_a86DdDKkW-ReVpQpqjndVS6GMrwXVpQY4G3-SGY7saMQ%40mail.gmail.com
Backpatch-through: 14

Branch
------
REL_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/16742849a3dea3d8e6331471cb5134ca4aec14b2

Modified Files
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doc/src/sgml/config.sgml | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

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