Fixes clock_gettime, which was actually an error in an L link

Refs #2568

doc/Language/nativecall.pod6

@@ -126,7 +126,7 @@ say "$result, $this-time"; # OUTPUT: «0, timespec<65385480>␤»
 =end code
 
 The L<original function we are calling,
-L<clock_gettime|/routine/clock_gettime>|https://linux.die.net/man/3/clock_gettime>, uses a pointer to
+L<clock_gettime|https://linux.die.net/man/3/clock_gettime>, uses a pointer to
 the C<timespec> struct as second argument. We declare it as a L<class|/syntax/class> here, but
 specify its representation as C<is repr('CStruct')>, to indicate it corresponds
 to a C data structure. When we create an object of that class, we are creating