-(AlfrescoRequest *) retrieveDocumentsInFolder:(AlfrescoFolder
        *)folder completionBlock:(AlfrescoArrayCompletionBlock)completionBlock - retrieves
      the immediate child documents of the given folder.
    Parameters
- (Folder *) folder
 - The name of the folder from which to retrieve the documents.
 - (AlfrescoArrayCompletionBlock) completionBlock
 - The block that is called with the documents on completion of the operation. The block has the format typedef void (^AlfrescoArrayCompletionBlock)(NSArray *array, NSError *error).
 
Returns
(AlfrescoRequest *)
Example