Instead of discussing if there's value or meaning (implied or not) in
the colors, let's use words without the same possibly negative
associations.
Closes#5546
- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
in manual examples
Closes https://github.com/curl/curl/pull/3037
