Merge #12716: Fix typos and cleanup in various files
Summary:
4d9b4256d8 Fix typos (Dimitris Apostolou)
Pull request description:
Unfortunately I messed up my repo while trying to squash #12593 so I created a PR with just the correct fixes.
Tree-SHA512: 295d77b51bd2a9381f1802c263de7ffb2edd670d9647391e32f9a414705b3c8b483bb0e469a9b85ab6a70919ea13397fa8dfda2aea7a398b64b187f178fe6a06
Backport of Core PR12716
https://github.com/bitcoin/bitcoin/pull/12716/
Test Plan:
make check arc lint
Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc
Reviewed By: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc
Differential Revision: https://reviews.bitcoinabc.org/D3805