message: Show alias in help message
  Improve feature discovery of help message
  Inspired by x.py help
  Improves
diff: @@ -274,14 +274,14 @@ OPTIONS:
  {unified}
  Some common cargo commands are (see all commands with --list):
  - build Compile the current package
  - check Analyze the current package and report errors, but don't build object files
  + build, b Compile the current package
  + check, c Analyze the current package and report errors, but don't build object files
  clean Remove the target directory
  doc Build this package's and its dependencies' documentation
  new Create a new cargo package
  init Create a new cargo package in an existing directory
  - run Run a binary or example of the local package
  - test Run the tests
  + run, r Run a binary or example of the local package
  + test, t Run the tests
  bench Run the benchmarks
  update Update dependencies listed in Cargo.lock
  search Search registry for crates
  