doc:  document the CREATE INDEX "USING" clause

Somehow this was in the syntax but had no description.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 10

Branch
------
REL_11_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/fd868582e2df970326d810d5085db4844f290c1d

Modified Files
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doc/src/sgml/ref/create_index.sgml | 12 ++++++++++++
1 file changed, 12 insertions(+)

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