Merge pull request #1100 from nicqrocks/master

Edit headers to 'is default' sections

Author: Altai-man

doc/Type/Sub.pod6

@@ -61,6 +61,8 @@ to it (or even themselves) and we can apply traits to objects at runtime.
     &trait_mod:<is>(&bar, :foo);
     # OUTPUT«is foo called␤is foo called␤»
 
+=head2 trait is default (Sub class)
+
 There is a special trait for C<Sub>s called C<is default>. This trait is
 designed as a way to disambiguate C<multi> function calls that would normally
 throw an error because Rakudo would not know which one to use. This means that

doc/Type/Variable.pod6

@@ -21,7 +21,7 @@ introspect and manipulate variables.
 
 Returns the name of the variable, including the sigil.
 
-=head2 trait is default
+=head2 trait is default (Variables)
 
     multi sub trait_mod:<is>(Variable:D, :$default!)