Mention `buck --help` when command line parsing fails
Mention `buck --help` when command line parsing fails

Summary: `buck --help` is mentioned when command line parsing fails, e.g. for `buck help` (invalid subcommand) or `buck -v` (invalid option).

Test Plan: Confirm `buck --help` is mentioned after `buck help`, `buck -v` etc.

Reviewed By: k21

fbshipit-source-id: 9c3fece

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