Minor typo fix in ngInit doc

[jdhiro]

No description provided.

[caitp]

Hah, that sounds like a rather heavy handed "only appropriate use" paragraph!

But just the same, the fix looks good to my eyes

[IgorMinar]

I'm sorry, but I wasn't able to verify your CLA signature. CLA signature is required for any code contributions to AngularJS.

Please sign our CLA and ensure that the CLA signature email address and the email address in this PR's commits match.

If you signed the CLA as a corporation, please let me know the company's name.

Thanks a bunch!

PS: If you signed the CLA in the past then most likely the email addresses don't match. Please sign the CLA again or update the email address in the commit of this PR.
PS2: If you are a Googler, please sign the CLA as well to simplify the CLA verification process.

[jdhiro]

I was under the impression that a CLA signature wasn't required for doc contributions, but I'll go ahead and sign it now.

[jdhiro]

OK, individual CLA submitted.