## Issue being fixed or feature implemented
## What was done?
Renamed `bitcoin` to `coins` in help texts of mining RPCs.
## How Has This Been Tested?
## Breaking Changes
no
## Checklist:
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have added or updated relevant unit/integration/functional/e2e
tests
- [x] I have made corresponding changes to the documentation
- [x] I have assigned this pull request to a milestone _(for repository
code-owners and collaborators only)_
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Co-authored-by: UdjinM6 <UdjinM6@users.noreply.github.com>
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