Incorrect SQL on CREATE INDEX page

In the "Examples" section of the page for CREATE INDEX:
http://www.postgresql.org/docs/current/static/sql-createindex.html
it says:
To create a GIN index with fast updates disabled:
CREATE INDEX gin_idx ON documents_table (locations) WITH (fastupdate = off);

This SQL fails with 'ERROR: unrecognized parameter "fastupdate"', as
it is missing the USING clause. Correct syntax should be:
CREATE INDEX gin_idx ON documents_table USING gin(locations) WITH
(fastupdate = off);

Also, a more minor quibble about the same section: the first example says:

To create a B-tree index on the column title in the table films:
CREATE UNIQUE INDEX title_idx ON films (title);

Perhaps the mention of "B-tree" should be omitted here, since "USING
btree" is not actually used in the SQL provided. Or is there an
explicit guarantee that CREATE UNIQUE INDEX will always use a B-Tree
documented somewhere?

Josh