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.hay...@fujitsu.com>
Reviewed-by: Aleksander Alekseev <aleksan...@timescale.com>
Discussion: 
https://postgr.es/m/oscpr01mb14966e14c1378dee51fb7b7c5f5...@oscpr01mb14966.jpnprd01.prod.outlook.com
Backpatch-through: 17

Branch
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REL_17_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/185d345d79095d705f02b3e1eb9fd0a06a144573

Modified Files
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doc/src/sgml/xfunc.sgml | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

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