Doc: fix confusion about LEAKPROOF in syntax summaries.

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

Commit: 2031e1668e5577e64cfed29da69a34903d5a5227
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-06-23T18:27:13Z
Releases: 14.0
Doc: fix confusion about LEAKPROOF in syntax summaries.

The syntax summaries for CREATE FUNCTION and allied commands
made it look like LEAKPROOF is an alternative to
IMMUTABLE/STABLE/VOLATILE, when of course it is an orthogonal
option.  Improve that.

Per gripe from aazamrafeeque0.  Thanks to David Johnston for
suggestions.

Discussion: https://postgr.es/m/162444349581.694.5818572718530259025@wrigleys.postgresql.org

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