[NFC] Update a few tests for concurrency diagnostics changes.

Author: hborla

test/Sema/moveonly_sendable.swift

@@ -48,7 +48,7 @@ func processFiles(_ a: A, _ anotherFile: borrowing FileDescriptor) async {
   await a.takeMaybeFile(.available(anotherFile))
   _ = A(.available(anotherFile))
 
-  let ns = await a.getRef() // expected-warning {{non-sendable type 'NotSendableMO' returned by implicitly async call to actor-isolated function cannot cross actor boundary}}
+  let ns = await a.getRef() // expected-warning {{non-sendable result type 'NotSendableMO' cannot be sent from actor-isolated context in call to instance method 'getRef()'}}
   await takeNotSendable(ns) // expected-complete-warning {{passing argument of non-sendable type 'NotSendableMO' outside of main actor-isolated context may introduce data races}}
 
   switch (await a.giveFileDescriptor()) {

validation-test/Sema/SwiftUI/rdar76252310.swift

@@ -42,7 +42,7 @@ func fromConcurrencyAware() async {
   let view = CoffeeTrackerView() // synthesized 'init' is 'nonisolated'
 
   // expected-note@+3 {{property access is 'async'}}
-  // expected-warning@+2 {{non-sendable type 'some View' in implicitly asynchronous access to main actor-isolated property 'body' cannot cross actor boundary}}
+  // expected-warning@+2 {{non-sendable type 'some View' of property 'body' cannot exit main actor-isolated context}}
   // expected-warning@+1 {{expression is 'async' but is not marked with 'await'}}
   _ = view.body