Add spack help --spec to README.md (#24849)

We don't really advertise `spack help --spec` enough. I think the README is a good place to start
doing that.
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Todd Gamblin 2021-07-13 05:04:41 -07:00 committed by GitHub
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@ -36,6 +36,8 @@ Documentation
[**Full documentation**](https://spack.readthedocs.io/) is available, or
run `spack help` or `spack help --all`.
For a cheat sheet on Spack syntax, run `spack help --spec`.
Tutorial
----------------