Rename TrainState.epoch as TrainState.iteration to better represent its actual meaning. #1962
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There are three commits. The first commit renames epoch as iteration. TrainState.epoch can still be used for now, but a warning will be raised each time it is used. The second commit changes all TrainState.epoch to TrainState.iteration in deepxde. The third commit replaces epochs in the document with iterations because epochs in Model.train() is depreciated long ago.