codespell: extend checks to more subdirs

- fix issues found.
- fix a few more found locally.

Closes #15072

tidy-up: adjust casing of project names

Mostly TLS/SSH project name.

Closes #14160

doh: fix leak and zero-length HTTPS RR crash

This PR fixes a leak and a crash that can happen when curl encounters
bad HTTPS RR values in DNS. We're starting to do better testing of that

doh: fix leak and zero-length HTTPS RR crash

This PR fixes a leak and a crash that can happen when curl encounters
bad HTTPS RR values in DNS. We're starting to do better testing of that
kind of thing and e.g. have published bad HTTPS RR values at
dodgy.test.defo.ie.

Closes #14151

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tests: fix shellcheck issues in `ech_tests.sh`

Add double-quotes where missing.

Follow-up to a362962b7289ec02b412890c9515657cf0ed50ac #11922
Closes #13382

tidy-up: whitespace [ci skip]

TLS: add support for ECH (Encrypted Client Hello)

An EXPERIMENTAL feature used with CURLOPT_ECH and --ech.

Closes #11922