Change batchify desc to remove ambiguity (#2383)

Co-authored-by: Carl Parker <carljparker@meta.com>

beginner_source/transformer_tutorial.py

@@ -149,7 +149,7 @@ def forward(self, x: Tensor) -> Tensor:
 # into ``batch_size`` columns. If the data does not divide evenly into
 # ``batch_size`` columns, then the data is trimmed to fit. For instance, with
 # the alphabet as the data (total length of 26) and ``batch_size=4``, we would
-# divide the alphabet into 4 sequences of length 6:
+# divide the alphabet into sequences of length 6, resulting in 4 of such sequences.
 #
 # .. math::
 #   \begin{bmatrix}