message: doc(pkgid): example for local package spec retrival
diff: @@ -81,5 +81,9 @@ Get the package ID for the given package instead of the current package.
  cargo pkgid https://github.com/rust-lang/crates.io-index#foo
  +4. Retrieve package specification for `foo` from a local package:
  +
  + cargo pkgid file:///path/to/local/package#foo
  +
  ## SEE ALSO
  {{man "cargo" 1}}, {{man "cargo-generate-lockfile" 1}}, {{man "cargo-metadata" 1}}
  