[encoding] Convert doc comment and fix doctest of SpecificCharacterSet::from_code #223
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This doctest was being ignored due to a regression in the compiler (rust-lang/rust#92872, rust-lang/rust#93038). It was only when the fix hit beta (v1.60) that it was identified that the test was missing an import.
I also looked for other doctests within block comments, but nothing more to report. One might as well default to line-based comments in the future and prefer not writing doc-tests inside block quotes.