format_code_in_doc_comments formats non-doc comments

[stepancheg]

echo '
// ```
// [
// ]
// ```
' | rustfmt --config format_code_in_doc_comments=true

outputs:

// ```
// []
// ```

This is not a doc comment, so I think it should not be reformatted.

Or at least documentation should be updated.

rustfmt --version
rustfmt 1.6.0-nightly (a991861e 2023-09-05)

[ytmimi]

Thanks for reaching out. I just looked into this and I believe #5536 will address this once it's merged

[ytmimi]

linking this to the tracking issue: #3348