ci: test doc's code snippets

[aasseman]

We can't rely on cargo llvm-cov test, which doesn't by default because of https://github.com/taiki-e/cargo-llvm-cov/issues/2

[github-actions[bot]]

🤖 Cargo Audit Report 🤖

(Empty means OK! 👍)

[github-actions[bot]]

Pull Request Test Coverage Report for Build 5511441677

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 85.117%

---

Totals
Change from base Build 5511432322:	0.0%
Covered Lines:	978
Relevant Lines:	1149

---

💛 - Coveralls

[aasseman]

Rebased onto latest main

[github-actions[bot]]

🤖 Cargo Audit Report 🤖

(Empty means OK! 👍)