Add Cargo.lock check and doc check to ch11

[QuarticCat]

• cargo fetch --locked checks that your Cargo.lock is compliant to your Cargo.toml. That is, if you update your Cargo.toml but forget to also update your Cargo.lock, this check will fail.
• cargo doc will send a few warnings like unresolved links (e.g. link [`abc`] that item abc is not found). But it doesn't supports arguments -Dwarnings as clippy. The only way is using an env var.

[atulkhare4096]

Another great suggestion and example of something I hadn't used before.