Fix docstring

kdtree/kdtree.pyx

@@ -114,13 +114,13 @@ cdef cypclass Node activable:
 
 cdef cypclass KDTree:
     """A KDTree based on asynchronous and parallel computations.
-    
-    It is similar to :class:`sklearn.neighbours.KDTree` but it is 
+
+    It is similar to :class:`sklearn.neighbours.KDTree` but it is
     using Cython+ features for asynchronous computations.
-    
-    Asynchronuous and parallel computations can be used when 
+
+    Asynchronuous and parallel computations can be used when
     constructing the nodes (see above) and when querying (WIP).
-    
+
     This relies on a Cython+ runtime using actors.
     """