As reported by the following command:
mandoc -T lint man/* | grep -v "input text line longer than 80 bytes"
(One of them also showed up as a warning while setting up Debian packaging.)
The existing explanations have proven confusing to many,
and presenting the instructions in a more visual manner should help a lot.
Additionally, the Unicode codepoints are typed as-is in the source,
because that allows much more WYSIWYG editing, and god damn it this is the year
two thousand and twenty three, if your man and/or terminal software does't
support Unicode, then what are you *doing*.