Batch_Normalization_Exercises.ipynb description discrepancy

[jetojedno]

In the text in Batch_Normalization_Exercises.ipynb it says: "strides of 1x1 on layers with odd depths" but the code says: "if layer_depth % 3 == 0"

This would only be accurate if the "odd" layers were translated into 2 graph layers and the "even" layers one (which is possible, but should be explained if true).

[lcrucks]

Internal ticket: https://udacity.atlassian.net/browse/DLND-1445