remove not used anymore custom diagnostic

Author: ktoso

include/swift/AST/DiagnosticsSema.def

@@ -5348,9 +5348,6 @@ ERROR(broken_distributed_actor_requirement,none,
 ERROR(distributed_actor_system_conformance_missing_adhoc_requirement,none,
       "%kind0 is missing witness for protocol requirement %1",
       (const ValueDecl *, DeclName))
-//NOTE(note_distributed_actor_system_conformance_missing_adhoc_requirement,none,
-//      "protocol %0 requires function %1 with signature:\n%2",
-//     (DeclName, DeclName, StringRef))
 
 ERROR(override_implicit_unowned_executor,none,
       "cannot override an actor's 'unownedExecutor' property that wasn't "