update return type declaration

Author: coke

doc/Type/Cursor.pod6

@@ -17,20 +17,20 @@ just with their relatives, L<Match> objects.
 
 =head2 method orig
 
-    method origin(Cursor:D:) returns Any
+    method origin(Cursor:D:) --> Any
 
 Returns the object against which the regex matches.
 
 =head2 method target
 
-    method target(Cursor:D:) returns Str:D
+    method target(Cursor:D:) --> Str:D
 
 Returns a string representation of the object against which the regex matches.
 This is the value that the regex engine works with internally.
 
 =head2 method pos
 
-    method pod(Cursor:D:) returns Int:D
+    method pod(Cursor:D:) --> Int:D
 
 Returns the current position as a string index into `Cursor.target`.