document interface change

ChangeLog

 Changes since NIFTy 5:
 
+Interface change in EndomorphicOperator.draw_sample()
+=====================================================
+
+This method now requires a `dtype` argument to be passed.
+As a consequence, `dtype` moves to the first place of the argument list.
+
 MPI parallelisation over samples in MetricGaussianKL
 ====================================================
 

nifty6/operators/endomorphic_operator.py

@@ -40,10 +40,10 @@ class EndomorphicOperator(LinearOperator):
 
         Parameters
         ----------
-        from_inverse : bool (default : False)
-            if True, the sample is drawn from the inverse of the operator
         dtype : numpy datatype
             the data type to be used for the sample
+        from_inverse : bool (default : False)
+            if True, the sample is drawn from the inverse of the operator
 
         Returns
         -------