typo correction in the name of the variable: decending -> descending

README.mkd

@@ -190,7 +190,7 @@ Notice how queries are built by chaining filter functions. The available filter
 We can also order the results using:
 
 * **Order**
-    * order(_parameter_name_, _decending_=False)
+    * order(_parameter_name_, _descending_=False)
 
 Users
 -----

parse_rest/query.py

@@ -97,9 +97,9 @@ class Queryset(object):
         return self
 
     @copy_method
-    def order(self, order, decending=False):
-        # add a minus sign before the order value if decending == True
-        self._options['order'] = decending and ('-' + order) or order
+    def order(self, order, descending=False):
+        # add a minus sign before the order value if descending == True
+        self._options['order'] = descending and ('-' + order) or order
         return self
 
     def exists(self):