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_15_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a5e2588a1c89cad1b2e1f1a4fd20632b4de6f986

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

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