Adding SR-13359 diagnostics to localization yaml files and minor comment

Author: LucianoPAlmeida

lib/Sema/CSDiagnostics.h

@@ -1079,7 +1079,7 @@ class MissingMemberFailure : public InvalidMemberRefFailure {
   /// e.g
   /// ```swift
   ///   let tuple: (Int, Int) = (0, 0)
-  ///   _ = tuple[0]
+  ///   _ = tuple[0] // -> tuple.0.
   ///  ```
   bool diagnoseForSubscriptMemberWithTupleBase() const;
 

localization/diagnostics/en.yaml

@@ -2967,6 +2967,16 @@
     value of type %0 has no property or method named 'subscript'; did you
     mean to use the subscript operator?
 
+- id: could_not_find_subscript_member_tuple
+  msg: >-
+    cannot access element using subscript for tuple type %0; 
+    use '.' notation instead
+
+- id: could_not_find_subscript_member_tuple_did_you_mean_use_dot
+  msg: >-
+    cannot access element using subscript for tuple type %0; 
+    did you mean to use '.%1'?
+
 - id: could_not_find_enum_case
   msg: >-
     enum type %0 has no case %1; did you mean %2?