Rollup of 7 pull requests

[matthiaskrgr]

Successful merges:

• CI: build FreeBSD artifacts on FreeBSD 13.4 #132232 (CI: build FreeBSD artifacts on FreeBSD 13.4)
• [cfg_match] Document the use of expressions. #135625 ([cfg_match] Document the use of expressions.)
• Add an example of using carrying_mul_add to write wider multiplication #135750 (Add an example of using carrying_mul_add to write wider multiplication)
• Ignore mermaid.min.js #135793 (Ignore mermaid.min.js)
• Add Kobzol on vacation #135810 (Add Kobzol on vacation)
• Use structurally_normalize instead of manual normalizes-to goals in alias relate errors #135816 (Use structurally_normalize instead of manual normalizes-to goals in alias relate errors)
• fix OsString::from_encoded_bytes_unchecked description #135821 (fix OsString::from_encoded_bytes_unchecked description)

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