Add units to the docstring of time-domain HRV indices

[aweinstein]

Function hrv_time return HRV indices. The units of these indices are milliseconds. However, the docstring does not mention that these are the units used.

Please add this information to the docstring.

[welcome]

Hi 👋 Thanks for reaching out and opening your first issue here! We'll try to come back to you as soon as possible. ❤️

[DominiqueMakowski]

Hi @aweinstein, thanks for reporting, please would you mind helping us by doing a quick PR to add that? I'm a bit under the water the moment

[aweinstein]

@DominiqueMakowski I just submitted the PR. I hope it helps.

[aweinstein]

Fixed by #1049.