Remove incorrect instructions to run CREATE FOREIGN DATA WRAPPER

The CREATE EXTENSION step does this automatically. Doing it again will
cause an error.

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/eb06416ba44ccbf3fe03a47739d9da4e4de42ced

Modified Files
--------------
doc/src/sgml/file-fdw.sgml |    8 --------
1 files changed, 0 insertions(+), 8 deletions(-)

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Next:	From: Bruce Momjian	Date: 2011-12-04 16:10:27
	Subject: Re: pgsql: Add file-fdw documentation example.
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	Subject: Re: pgsql: Add file-fdw documentation example.