An @item directive was missing, making the documentation appear
incorrectly as part of -Wno-exceptions.
PR c++/123639
gcc/ChangeLog:
* doc/invoke.texi: Add @item for -Wsfinae-incomplete.
@opindex Wsfinae-incomplete
@opindex Wno-sfinae-incomplete
+@item -Wsfinae-incomplete @r{(C++ and Objective-C++ only)}
Warn about a class that is found to be incomplete, or a function with
auto return type that has not yet been deduced, in a context where
that causes substitution failure rather than an error, and then the