Update README.md (#863)
Update README.md (#863)

* Update README.md

Fixed some common typing mistakes. Removed one "from" from the Downloading a Release from GitHub topic.

* Update README.md

Co-authored-by: Andrew Starr-Bochicchio <bb30e9a9107f9f5fe64ebae3fa4f782ea41f2d34@users.noreply.github.com>
digitalocean/doctl,digitalocean/doctl