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

There is an file-fdw example that reads the server config file, so crosslink them.Reported-by: Oleg SamoilovDiscussion:https://postgr.es/m/159800192078.2886.10431506404995508950@wrigleys.postgresql.orgBackpatch-through: 9.5

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`@@ -7075,6 +7075,8 @@ CREATE TABLE postgres_log`
`7075`	`7075`	`<programlisting>`
`7076`	`7076`	`COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;`
`7077`	`7077`	`</programlisting>`
	`7078`	`+ It is also possible to access the file as a foreign table, using`
	`7079`	`+ the supplied <xref linkend="file-fdw"/> module.`
`7078`	`7080`	`</para>`
`7079`	`7081`
`7080`	`7082`	`<para>`

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`@@ -216,7 +216,9 @@`
`216`	`216`	`<para>`
`217`	`217`	`One of the obvious uses for <literal>file_fdw</literal> is to make`
`218`	`218`	`the PostgreSQL activity log available as a table for querying. To`
`219`		`- do this, first you must be logging to a CSV file, which here we`
	`219`	`+ do this, first you must be <link`
	`220`	`+ linkend="runtime-config-logging-csvlog">logging to a CSV file,</link>`
	`221`	`+ which here we`
`220`	`222`	`will call <literal>pglog.csv</literal>. First, install <literal>file_fdw</literal>`
`221`	`223`	`as an extension:`
`222`	`224`	`</para>`

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