Fix command descriptions

heroku / heroku-repo

Plugin for heroku CLI that can manipulate the repo

MIT License

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Fix command descriptions #80

Closed citizen428 closed 6 years ago

citizen428 commented 6 years ago

The description of purge_cache was missing the word "of". Also the different tasks didn't consistently use the same grammatical person (i.e. "set" vs "sets") so I changed everything to the more common style.