- (AlfrescoRequest *)checkoutDocument:(AlfrescoDocument *)document
        completionBlock:(AlfrescoDocumentCompletionBlock)completionBlock - Checks out the
      document, if successful the private working copy is returned.
    Parameters
- (AlfrescoDocument *) document
 - The document to check out.
 - (AlfrescoDocumentCompletionBlock) completionBlock
 - The block that is called with the result on completion of the operation. The completion block has the format typedef void (^AlfrescoDocumentCompletionBlock)(AlfrescoDocument *document, NSError *error);.
 
Returns
(AlfrescoRequest *)
Example