[PATCH] fix wrong create table statement in documentation

In the current documentation [1] this create table statement is listed:

CREATE TABLE measurement_y2008m01 PARTITION OF measurement
FOR VALUES FROM ('2008-01-01') TO ('2008-02-01')
TABLESPACE fasttablespace
WITH (parallel_workers = 4);

But that did not work:

2017-11-06 22:26:11.757 CET [4699] ERROR: syntax error at or near
"WITH" at character 130
2017-11-06 22:26:11.757 CET [4699] STATEMENT: create table
measurement_y2008m01 partition of measurement for values from
('2008-01-01') to ('2008-02-01') tablespace fastspace WITH (
parallel_workers = 4 );

^
The TABLESPACE part should be listed behind the WITH storage parameter.
I attachted the patch.

[1]
https://www.postgresql.org/docs/10/static/ddl-partitioning.html#ddl-partitioning-declarative