Add missing closing parens.
It's possible that it's really meant to be closed after "(which is the default)" by adding a second closing parens to to close the outer statement. I wasn't sure, but this seemed more likely in my mind.
@@ -49,7 +49,7 @@ class BatchNormalizationBase(Layer):
- `beta` is a learned offset factor (initialized as 0), which
can be disabled by passing `center=False` to the constructor.
- **During inference** (i.e. when using `evaluate()` or `predict()` or when
+ **During inference** (i.e. when using `evaluate()` or `predict()`) or when
calling the layer/model with the argument `training=False` (which is the
default), the layer normalizes its output using a moving average of the
mean and standard deviation of the batches it has seen during training. That
