os: adopt multiwait naming over waitable

stratosphere/pm/source/impl/pm_process_info.hpp

@@ -46,7 +46,7 @@ namespace ams::pm::impl {
             Handle handle;
             svc::ProcessState state;
             u32 flags;
-            os::WaitableHolderType waitable_holder;
+            os::MultiWaitHolderType multi_wait_holder;
         private:
             void SetFlag(Flag flag) {
                 this->flags |= flag;
@@ -64,8 +64,8 @@ namespace ams::pm::impl {
             ~ProcessInfo();
             void Cleanup();
 
-            void LinkToWaitableManager(os::WaitableManagerType &manager) {
-                os::LinkWaitableHolder(std::addressof(manager), std::addressof(this->waitable_holder));
+            void LinkToMultiWait(os::MultiWaitType &multi_wait) {
+                os::LinkMultiWaitHolder(std::addressof(multi_wait), std::addressof(this->multi_wait_holder));
             }
 
             Handle GetHandle() const {