doc:  clarify that storage parameter values are optional

In a few cases, the documented syntax specified storage parameter values
as required.

Reported-by: [email protected]

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

Backpatch-through: 9.5

Branch
------
REL9_6_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/f1a346ec4d3fac233f98cdb1af25245f5e1a8b31

Modified Files
--------------
doc/src/sgml/ref/alter_index.sgml             | 4 ++--
doc/src/sgml/ref/alter_materialized_view.sgml | 2 +-
doc/src/sgml/ref/alter_table.sgml             | 4 ++--
doc/src/sgml/ref/create_index.sgml            | 2 +-
4 files changed, 6 insertions(+), 6 deletions(-)

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