doc: document the CREATE INDEX "USING" clause

Bruce Momjian <bruce@momjian.us>

Commit: 5d499dab755f6e2abe365983c2f9a70f220fa703
Author: Bruce Momjian <bruce@momjian.us>
Date: 2022-08-12T15:26:03Z
Releases: 15.0
doc:  document the CREATE INDEX "USING" clause

Somehow this was in the syntax but had no description.

Reported-by: robertcorrington@gmail.com

Discussion: https://postgr.es/m/164228771825.31954.2719791849363756957@wrigleys.postgresql.org

Backpatch-through: 10

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doc/src/sgml/ref/create_index.sgml modified +12 −0

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