-(AlfrescoRequest *) updateCommentOnNode:(AlfrescoNode *)node
        comment:(AlfrescoComment *)comment content:(NSString *)content
        completionBlock:(AlfrescoCommentCompletionBlock)completionBlock - Updates the
      comment on the given node with the provided content.
    Parameters
- (AlfrescoNode *) node
 - The node to which the comment is attached.
 - (AlfrescoComment *) comment
 - The comment to be updated.
 - (NSString *) content
 - The content of the comment.
 - (AlfrescoCommentCompletionBlock) completionBlock
 - The block that is called with the updated comment on completion of the operation. The completion block has the format typedef void (^AlfrescoCommentCompletionBlock)(AlfrescoComment *comment, NSError *error).
 
Returns
(AlfrescoRequest *)
Example