Fix missing parameter docstrings

[nerkulec]

Included a few of missing docstrings and removed a few parameters which are not used

[elcorto]

Thanks this looks good. I still think an extended example as suggested in #573 would be a nice-to-have, but as far as doc strings go, all good. 👍

[RandomDefaultUser]

Thanks for this PR @nerkulec, I have one questin before merging. I just finished working on #613 , and was looking at this PR as well so as not to do the same work twice. I realized that the following docstrings in ParametersRunning are still missing:

l1_regularization
l2_regularization
learning_rate_embedding
input_noise
batch_norm
dropout
use_compression
checkpoint_best_so_far
snapshots_per_epoch
training_log_interval

If I am not mistaken, you added these parameters. Could you also add a docstring for these parameters? If I am mistaken and some of these are from older MALA changes, e.g., by Josh, let me know and I will take care of them.

[RandomDefaultUser]

I added the missing docstrings in #613.
As it turns out, most of these parameters are currently unused, so I commented them out, and would suggest we add a docstring once they are used/commented in again.

[RandomDefaultUser]

I will merge this PR, and then adapt #613 accordingly.