doc: Slightly correct advice on C/C++ linkage

Peter Eisentraut <peter@eisentraut.org>

Commit: 794ba8b6a4c8ce409a37e84444c9519f7f1e5385
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2026-01-14T14:05:29Z
doc: Slightly correct advice on C/C++ linkage

The documentation was writing that <literal>extern C</literal> should
be used, but it should be <literal>extern "C"</literal>.

Files

PathChange+/−
doc/src/sgml/xfunc.sgml modified +3 −3