INDEX with optional storage parameter value

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Page: https://www.postgresql.org/docs/12/sql-createindex.html
Description:

Hello!
I noticed an slight inaccuracy in the documentation for CREATE INDEX and
ALTER INDEX:

CREATE INDEX ... [ WITH ( storage_parameter = value [, ... ] ) ]
ALTER INDEX [ IF EXISTS ] name SET ( storage_parameter = value [, ... ] )

In indices, as in tables, you can omit the вoolean value for a parameter.
For example:

CREATE INDEX ON public.testtable USING GIN (c1) WITH (fastupdate);
ALTER INDEX testtable_c1_idx SET (fastupdate);

It might be more correct to use the construct from CREATE TABLE: 

storage_parameter [= value] [, ... ]