Match unmatched backticks in library/
Found with GNU grep:
```
grep -rEn '^(([^`]*`){2})*[^`]*`[^`]*$' library/ | rg -v '\s*[//]?.{1,2}```'
```
split out from #108685 as per advice.
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|---|---|---|
| .. | ||
| benches | ||
| primitive_docs | ||
| src | ||
| tests | ||
| Cargo.toml | ||