perlintern: djSP doesn't take arguments

Author: khwilliamson

pp.h

@@ -79,7 +79,7 @@ L<perlcall>.
 Declares a local copy of perl's stack pointer for the XSUB, available via
 the C<SP> macro.  See C<L</SP>>.
 
-=for apidoc m;||djSP
+=for apidoc mn;||djSP
 
 Declare Just C<SP>.  This is actually identical to C<dSP>, and declares
 a local copy of perl's stack pointer, available via the C<SP> macro.