Update this file - minor gramatical changes

[doctordns]

1. Removed contractions for consistency and to improve readability especially for those who are not native English speakers.
2. Remove future tense. Improves readability and ensures that the reader understands the specific features are available today.
3. Changed discussion of pre/post scripts under Linux to remove passive voice and to clarify who calls the scripts. This improves reabaility.

Minor updates to a surperb article.

[msftclas]

@doctordns,
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[jomolnar]

@markgalioto Hi Mark. Please review these proposed contributions. Thanks.

[markgalioto]

@doctordns Thank you for providing the feedback. My apologies, seriously, for not getting to this sooner. Because this article has been updated by others since your PR was submitted, there are merge conflicts. I am responsible for fixing those merge conflicts. So I've taken your fixes (except for un-doing the contractions), and submitted those in a separate PR which should go live very soon. You are correct that contractions can create issues for localization. But we are trying to create a more friendly tone for Azure documentation, and one of those ways is to use, or at least allow, contractions. Thanks again for your feedback.
#please-close

[doctordns]

Thanks for the reply and thanks for fixing the issue. I appreciate your fixing this!

As for contractions - I am slightly confused, you seem to say you are in favour of minimising issues for localisation, then you say contractions are still ok? Hmmm. Elsewhere in the documentation, contractions HAVE been removed.