Doc: add a bit to indices.sgml about what is an indexable clause.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 499342e81b0fba471889439e47e0c37fe9e62bc0
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-12-17T21:49:44Z
Releases: 12.18
Doc: add a bit to indices.sgml about what is an indexable clause.

We didn't explain this clearly until somewhere deep in the
"Extending SQL" chapter, but really it ought to be mentioned
in the introductory material too.

Discussion: https://postgr.es/m/4097442.1694967650@sss.pgh.pa.us

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doc/src/sgml/indices.sgml modified +34 −1

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