Merge #12747: Fix typos

Summary:
d27327c79a Fix typos (practicalswift)

Pull request description:

Fix typos.

Tree-SHA512: f0d13d991acdec0d3adc2f091cd00ccbdda6da3c7623dfb4cbf698bac9eb6b3d88c8ad121256a96cb130f8e97bf54892f3616da0e8dc833dcf713ca7949e2801

Backport of Core PR12747
https://github.com/bitcoin/bitcoin/pull/12747/

Test Plan:

make check
arc lint --everything

Reviewers: deadalnix, Fabien, jasonbcox, O1 Bitcoin ABC, #bitcoin_abc

Reviewed By: Fabien, O1 Bitcoin ABC, #bitcoin_abc

Differential Revision: https://reviews.bitcoinabc.org/D3893