use word to avoid spellcheck

Author: coke

doc/Type/Signature.pod6

@@ -245,7 +245,7 @@ rather than an object instance.
     say can-turn-into("3", Int);
     say can-turn-into("6.5", Int);
     say can-turn-into("6.5", Num);
-    say can-turn-into("NotANum", Num);
+    say can-turn-into("a string", Num);
     # OUTPUT: True True True False
 
 For explicitly indicating the normal behaviour, C<:_> can be used, but this is