Fix commands related to maturin in building docs

[gschurck]

This PR fixes two things in the building docs :

• Documentation suggests to install latest maturin version, but the version pinned in pyproject.toml is ~=1.4.0, resulting in this warning :

  ⚠️  Warning: You specified maturin ~=1.4.0 in pyproject.toml under `build-system.requires`, but the current maturin version is 1.7.6
  

• Build commands in docs use --cargo-extra-args option but it is removed since version O.13 :

  ❯ maturin build --cargo-extra-args="--features llvm14-0"
  error: unexpected argument '--cargo-extra-args' found
  
    tip: a similar argument exists: '--target'
  
  Usage: maturin build <--quiet|--jobs <N>|--profile <PROFILE-NAME>|--features <FEATURES>|--all-features|--no-default-features|--target <TRIPLE>|--target-dir <DIRECTORY>|--manifest-path <PATH>|--ignore-rust-version|--verbose...|--color <WHEN>|--frozen|--locked|--offline|--config <KEY=VALUE>|-Z <FLAG>|--timings=<FMTS>|--future-incompat-report|ARGS>
  
  For more information, try '--help'.
  

[swernli]

@microsoft-github-policy-service rerun