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_19_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/fe624a3fdbf5bc6ecdcd1519d8cc0c8f38cfd1e5

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

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