bug#46039: 26.3; Mention how to get _only_ syntactic font lock

[Lars Ingebrigtsen]

Drew Adams <drew.adams@oracle.com> writes:

> I looked for doc that spoke to this directly, but didn't find any.  The
> doc tells you how to do the _opposite_: get only search-based
> font-locking, and not also syntactic font-locking.  But I didn't find
> anything explicitly saying how to get only syntactic font-locking.
>
> If I'm right that this isn't mentioned explicitly, please consider
> mentioning it.  It's a reasonable use case.

I've now mentioned it in the Emacs 29 lispref manual.

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