NFC: Remove 'actor class' from diagnostics

Author: etcwilde

include/swift/AST/DiagnosticsSema.def

@@ -4323,7 +4323,7 @@ ERROR(async_objc_dynamic_self,none,
       "asynchronous method returning 'Self' cannot be '@objc'", ())
 
 ERROR(actor_with_nonactor_superclass,none,
-      "actor class cannot inherit from non-actor class %0", (DeclName))
+      "actor cannot inherit from non-actor class %0", (DeclName))
 
 ERROR(actor_isolated_non_self_reference,none,
         "actor-isolated %0 %1 can only be %select{referenced|mutated|used 'inout'}3 "
@@ -4500,7 +4500,7 @@ ERROR(multiple_global_actors,none,
 ERROR(global_actor_disallowed,none,
       "%0 cannot have a global actor", (DescriptiveDeclKind))
 ERROR(global_actor_on_actor_class,none,
-      "actor class %0 cannot have a global actor", (Identifier))
+      "actor %0 cannot have a global actor", (Identifier))
 ERROR(global_actor_on_local_variable,none,
       "local variable %0 cannot have a global actor", (DeclName))
 ERROR(global_actor_non_unsafe_init,none,

test/attr/global_actor.swift

@@ -83,7 +83,7 @@ class SomeClass {
 
 @GA1 typealias Integer = Int // expected-error{{type alias cannot have a global actor}}
 
-@GA1 actor ActorInTooManyPlaces { } // expected-error{{actor class 'ActorInTooManyPlaces' cannot have a global actor}}
+@GA1 actor ActorInTooManyPlaces { } // expected-error{{actor 'ActorInTooManyPlaces' cannot have a global actor}}
 
 @GA1 @OtherGlobalActor func twoGlobalActors() { } // expected-error{{declaration can not have multiple global actor attributes ('OtherGlobalActor' and 'GA1')}}
 

test/decl/class/actor/basic.swift

@@ -13,7 +13,7 @@ actor class MyActorClass { }
 
 class NonActor { }
 
-actor NonActorSubclass : NonActor { } // expected-error{{actor class cannot inherit from non-actor class 'NonActor'}}
+actor NonActorSubclass : NonActor { } // expected-error{{actor cannot inherit from non-actor class 'NonActor'}}
 
 // expected-warning@+1{{'actor class' has been renamed to 'actor'}}{{14-20=}}
 public actor class BobHope {}