[clang] [Clang] Clarify diagnostic notes for implicitly generated deduction guides (PR #96084)

[Haojian Wu via cfe-commits]

================
@@ -627,6 +627,9 @@ Improvements to Clang's diagnostics
   used rather than when they are needed for constant evaluation or when code is generated for them.
   The check is now stricter to prevent crashes for some unsupported declarations (Fixes #GH95495).
 
+- Clang now shows implicit deduction guides corresponding to implcitly defined constructors when 
----------------
hokein wrote:

nit: this doesn't cover the using alias case, maybe just `Clang now shows implicitly generated deduction guides when diagnosing overload resolution failure.`

https://github.com/llvm/llvm-project/pull/96084