Merge pull request #1601 from fluca1978/method-precedence-drop

Fix "head2" POD title section.

Author: Altai-man

doc/Language/syntax.pod6

@@ -677,7 +677,7 @@ Within a method the special variable C<self> contains the object instance
 
 For more information see L<functions|/language/functions>.
 
-=head 2 Precedence Drop
+=head2 Precedence Drop
 
 In the case of method invocation (i.e., when invoking a subroutine against
 a class instance) it is possible to apply the C<precedence drop>, identified