The `restriction` group contains many lints which are not about
necessarily “bad” things, but style choices — perhaps even style choices
which contradict conventional Rust style — or are otherwise very
situational. This results in silly wording like “Why is this bad?
It isn't, but ...”, which I’ve seen confuse a newcomer at least once.
To improve this situation, this commit replaces the “Why is this bad?”
section heading with “Why restrict this?”, for most, but not all,
restriction lints. I left alone the ones whose placement in the
restriction group is more incidental.
In order to make this make sense, I had to remove the “It isn't, but”
texts from the contents of the sections. Sometimes further changes
were needed, or there were obvious fixes to make, and I went ahead
and made those changes without attempting to split them into another
commit, even though many of them are not strictly necessary for the
“Why restrict this?” project.
Modify lint pass note for consistency with the book
This PR:
- removes the note which appears when an early lint pass is created using `cargo dev new_lint`.
- adds a note that encourages contributors to use an early pass unless type information is needed if a late lint pass is created using `cargo dev new_lint`.
Late pass remains the default value if no pass is specified as most lints use late pass.
Closes#12595
changelog: none
