doc: Mention naming convention used by injection points

Michael Paquier <michael@paquier.xyz>

Commit: e29df428a1dca4112aad640c889a9a54642759c9
Author: Michael Paquier <michael@paquier.xyz>
Date: 2025-04-22T03:41:29Z
Releases: 18.0
doc: Mention naming convention used by injection points

All the injection points used in the tree have relied on an implied
rule: their names should be made of lower-case characters, with dashes
between the words used.

This commit adds a light mention about that in the docs, encouraging the
practice.

Author: Hayato Kuroda <kuroda.hayato@fujitsu.com>
Reviewed-by: Aleksander Alekseev <aleksander@timescale.com>
Discussion: https://postgr.es/m/OSCPR01MB14966E14C1378DEE51FB7B7C5F5B32@OSCPR01MB14966.jpnprd01.prod.outlook.com
Backpatch-through: 17

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