More tweaks from review

src/darwin/Framework/CHIP/MTRAsyncWorkQueue.h

@@ -130,6 +130,10 @@ MTR_TESTABLE
 /// Note: This handler is NOT called on the dispatch queue associated with
 /// this work item. Thread-safety is managed by the work queue internally.
 ///
+/// If no `batchingHandler` is set using this method, the work item will not
+/// participate in batching, and the `batchingID` and `batchableData`
+/// properties are  meaningless.
+///
 /// @see MTRAsyncWorkBatchingHandler
 - (void)setBatchingID:(NSUInteger)opaqueBatchingID
                  data:(id)opaqueBatchableData
@@ -143,6 +147,10 @@ MTR_TESTABLE
 /// Note: This handler is NOT called on the dispatch queue associated with
 /// this work item. Thread-safety is managed by the work queue internally.
 ///
+/// If no `duplicateCheckHandler` is set using this method, the work item
+/// will not participate in duplicate checking, and the `duplicateTypeID`
+/// property is meaningless.
+///
 /// @see MTRAsyncWorkDuplicateCheckHandler
 - (void)setDuplicateTypeID:(NSUInteger)opaqueDuplicateTypeID
                    handler:(MTRAsyncWorkDuplicateCheckHandler)duplicateCheckHandler;

src/darwin/Framework/CHIP/MTRAsyncWorkQueue.mm

@@ -202,8 +202,9 @@ - (void)enqueueWorkItem:(MTRAsyncWorkItem *)item
 
 - (void)invalidate
 {
+    NSString * contextDescription = [_context description]; // outside of lock
     os_unfair_lock_lock(&_lock);
-    MTR_LOG_INFO("MTRAsyncWorkQueue<%@> invalidate %tu items", _context, _items.count);
+    MTR_LOG_INFO("MTRAsyncWorkQueue<%@> invalidate %tu items", contextDescription, _items.count);
     for (MTRAsyncWorkItem * item in _items) {
         [item cancel];
     }