fix typo

Author: coke

doc/Type/Method.pod6

@@ -22,7 +22,7 @@ use the declarators C<my> and C<method>:
     # OUTPUT«("a", "b", "c")␤(a b c)␤»
 
 The invocant of a method defaults to C<self>. A type constraint including a
-type-smily can be used and is honored both for methods defined in a class and
+type-smiley can be used and is honored both for methods defined in a class and
 for free floating methods. Call the latter with C<.&> on an object.
 
     my method m(Int:D: $b){