Fix error and not expectation

Author: tristanlabelle

test/attr/attr_availability_unavailability.swift

@@ -62,10 +62,11 @@ func testUnavailableExpandAllElsePaths() {
 
 func log(message: String) {}
 
-@available(*, unavailable, renamed: "foo(arg:)")
+@available(*, unavailable, renamed: "log(message:)")
 func log(format: String, _ args: Any...) { fatalError() }
 
 // Regression test for https://github.com/apple/swift/issues/64694
 func testUnavailableRenamedFromVariadicDoesntAssert() {
   log(format: "") // expected-error{{'log(format:_:)' has been renamed to 'log(message:)'}}
+  // expected-note@-1 {{'log(format:_:)' has been explicitly marked unavailable here}}
 }