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

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

Commit: afc987e196107b0887314838256a885af05b8714
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2023-12-17T21:49:44Z
Releases: 15.6
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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