Adaptation of .batch description; closes #2969

doc/Type/List.pod6

@@ -1109,10 +1109,13 @@ Defined As:
     multi method batch(Int:D $batch --> Seq)
     multi method batch(Int:D :$elems --> Seq)
 
-Returns a C<Seq> of the elements in batches of C<:$elems> or C<$batch>,
-respectively. If the number of elements is not a multiple of C<$batch>, the
-last batch may have less than C<$batch> elements, similar to
-C<.rotor($batch, :partial)>.
+Returns a sequence of lists, wherein each list with the exception of the last
+one is guaranteed to comprise a number of elements equal to the batch size
+specified by C<$batch> or C<$elems>, respectively. If the invocant has a number
+of elements that is not an integer multiple of the batch size, the last list in
+the returned sequence will contain any remaining elements and thus have less
+than C<$batch> or C<$elems> elements. Accordingly, C<.batch($batch)> is
+shorthand for C<.rotor($batch, :partial)>.
 
 =head2 routine cross