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_12_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/02fb7eef91df41fab9c68cc73e6ec9f22c060981

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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