doc: Correct the description of server behavior after an OOM kill

The documentation stated that existing connections would continue to
function normally after the OOM killer terminated the postmaster.
In fact, those connections eventually terminate when server processes
detect the postmaster's death.

Clarify that the OOM killer can terminate either the postmaster or a
child process. If the postmaster is killed, the server must be restarted.
If a child process is killed, PostgreSQL typically terminates the
remaining connections and either recovers automatically or shuts down,
depending on restart_after_crash.

Backpatch to all supported versions.

Author: Takeshi Ideriha <[email protected]>
Reviewed-by: Manuel Reyes Bravo <[email protected]>
Reviewed-by: Fujii Masao <[email protected]>
Discussion: https://postgr.es/m/[email protected]
Backpatch-through: 14

Branch
------
REL_18_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/dfbc1507cdb5aed65d420b620960abaf1cdd9fd2

Modified Files
--------------
doc/src/sgml/runtime.sgml | 20 +++++++++++++-------
1 file changed, 13 insertions(+), 7 deletions(-)

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