Clarify which method we're selecting

Thanks to fbstj for pointing out this potential ambiguity.

Author: traviscross

text/3624-supertrait-item-shadowing-v2.md

@@ -6,7 +6,7 @@
 # Summary
 [summary]: #summary
 
-When method selection encounters an ambiguity between two trait methods when both traits are in scope, if one trait is a subtrait of the other then select that method instead of reporting an ambiguity error.
+When method selection encounters an ambiguity between two trait methods when both traits are in scope, if one trait is a subtrait of the other then select the method from the subtrait instead of reporting an ambiguity error.
 
 # Motivation
 [motivation]: #motivation