Extend explaination of nesting capture markers.

Author: fluca1978

doc/Language/regexes.pod6

@@ -978,7 +978,8 @@ C<\K>.
     say 'abc' ~~ / <(a <( b )> c)>/;        # OUTPUT: «｢bc｣␤»
 
 As the example above, you can see C«<(» sets the start point and C«)>» sets the
-endpoint. They are actually independent.
+endpoint; since they are actually independent each other, the inner-most start point
+wins (the one attache to C<b>) and the outer-most end wins (the one attached to C<c>).
 
 =head1 Substitution