Fix: update mining documentation (#39)

Silvio Rhattorequested to merge
rhatto/onionspray:fix/mining into main

Cleanup and update the mining documentation.

Also takes some suggestions from iamwacko's EOTK pull request at https://github.com/alecmuffett/eotk/pull/108

Also fixes typos found by jschauma's EOTK pull request at https://github.com/alecmuffett/eotk/pull/106

Closes #39 (closed).

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