doc: cross-link file-fdw and CSV config log sections

There is an file-fdw example that reads the server config file, so cross
link them.

Reported-by: Oleg Samoilov

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.5

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/5e22362d3199a0946f4e5204f8185370fcc2bded

Modified Files
--------------
doc/src/sgml/config.sgml   | 2 ++
doc/src/sgml/file-fdw.sgml | 4 +++-
2 files changed, 5 insertions(+), 1 deletion(-)

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