-(AlfrescoRequest *) retrieveCommentsForNode:(AlfrescoNode *)node
        withListingContext:(AlfrescoListingContext *)listingContext
        completionBlock:(AlfrescoArrayCompletionBlock)completionBlock - retrieves the
      comments for a given node with a listing context.
    Parameters
- (AlfrescoNode *) node
 - The node for which the comments are to be retrieved.
 - (AlfrescoListingContext *) listingContext
 - The listing context with a paging definition that's used to retrieve the activity stream.
 - (AlfrescoPagingResultCompletionBlock) completionBlock
 - The block that is called with the retrieved comments on completion of the operation. The completion block has the format typedef void (^AlfrescoPagingResultCompletionBlock)(AlfrescoPagingResult *pagingResult, NSError *error).
 
Returns
(AlfrescoRequest *)
Example