Typos in notebooks 01 and 02

[lombardo-luca]

Corrected a few typos and slips. From notebook01:

The model goes through all of the training data once, performing its forward() function calculations.

To:

The model goes through all of the testing data once, performing its forward() function calculations.

From notebook02:

What do you think will happen when we introduce the capability for our model to use non-linear actviation functions?

To:

What do you think will happen when we introduce the capability for our model to use non-linear activation functions?

From:

2. Calcuate loss and accuracy

To:

2. Calculate loss and accuracy

From:

To measure model accuray

To:

To measure model accuracy

[mrdbourke]

Thank you very much!