Can't get metrics/components registered names from deeppavlov doc pages

Created by: yurakuratov

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What problem are we trying to solve?:

It is not clear from documentation on docs.deeppavlov.ai, e.g.,  http://docs.deeppavlov.ai/en/master/apiref/metrics.html how to get metrics name for using them in configuration file.

`sk_log_loss` -> should be used as `log_loss`. How to get this info?

How can we solve it?:

Add register name to doc page for all classes/components/metrics.

Are there other issues that block this solution?:

No.