[NFC] Make override_nsobject_hash_error Look Like override_nsobject_hashvalue_error

Author: CodaFi

include/swift/AST/DiagnosticsSema.def

@@ -5402,8 +5402,8 @@ ERROR(override_nsobject_hashvalue_error,none,
       "did you mean to override 'NSObject.hash'?", ())
 
 ERROR(override_nsobject_hash_error,none,
-      "`NSObject.hash(into:)` is not overridable; "
-      "subclasses can customize hashing by overriding the `hash` property", ())
+      "'NSObject.hash(into:)' is not overridable; "
+      "did you mean to override 'NSObject.hash'?", ())
 
 WARNING(hashvalue_implementation,none,
         "'Hashable.hashValue' is deprecated as a protocol requirement; "

test/ClangImporter/objc_override.swift

@@ -116,7 +116,7 @@ class MyHashableNSObject: NSObject {
   }
 
   override func hash(into hasher: inout Hasher) {
-    // expected-error@-1 {{`NSObject.hash(into:)` is not overridable; subclasses can customize hashing by overriding the `hash` property}}
+    // expected-error@-1 {{'NSObject.hash(into:)' is not overridable; did you mean to override 'NSObject.hash'?}}
   }
 }
 

test/stdlib/NSObject-hashing.swift

@@ -12,6 +12,6 @@ class Foo: NSObject {
   }
 
   override func hash(into hasher: inout Hasher) {
-    // expected-error@-1 {{`NSObject.hash(into:)` is not overridable; subclasses can customize hashing by overriding the `hash` property}}
+    // expected-error@-1 {{'NSObject.hash(into:)' is not overridable; did you mean to override 'NSObject.hash'?}}
   }
 }