pgsql: doc: improve wording of "foreign data server" in file-fdw docs

doc: improve wording of "foreign data server" in file-fdw docs

Backpatch to 9.2

Shigeru HANADA

Branch
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REL9_2_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/a33c0045a86d128d175e94f472e575b7daaecb91

Modified Files
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doc/src/sgml/file-fdw.sgml | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

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