Fix typo in docstring
Corrected a small annotation in Input()
@@ -1370,7 +1370,7 @@ def Input(shape=None, batch_shape=None,
attributes that allow us to build a Keras model
just by knowing the inputs and outputs of the model.
- For instance, if a, b and c and Keras tensors,
+ For instance, if a, b and c are Keras tensors,
it becomes possible to do:
`model = Model(input=[a, b], output=c)`
