(GH-595) Spelling mistakes

[maharishi]

Changed spelling mistakes.

Closes #595

[ferventcoder]

Did you submit this prior to reading over contributing or receiving my advice about reading it to save you pain later?

[ferventcoder]

Please read over https://github.com/chocolatey/choco/blob/master/CONTRIBUTING.md and make the adjustments to the commit message. :)

[ferventcoder]

@maharishi specifically https://github.com/chocolatey/choco/blob/master/CONTRIBUTING.md#prepare-commits and https://github.com/chocolatey/choco/blob/master/CONTRIBUTING.md#respond-to-feedback-on-pull-request because you are going to need these now.

Also, I see you submitted the PR from your master branch. We like all PRs to come from a feature branch, as documented in the contributing document I asked you to read. I know it looks like a wall of text, but it's very detailed in our expectations. And makes for less pain on your part later.

[ferventcoder]

Ping @maharishi

[ferventcoder]

@maharishi Have you had a chance to review the feedback I provided? If you don't want to fix this PR up, let me know and I will go ahead and just make the change and close this PR. Thanks!

[ferventcoder]

Fixed up and merged into stable at fdf3fbf.

Thanks for the contribution! Now we'll just need to ensure you are getting the messages.