docs: fix style in getting-started section

[timonegk]

How to categorize this PR?
/kind cleanup

What this PR does / why we need it:

While reading the Getting Started docs for Gardener, I noticed some style inconsistencies or small mistakes (wrong punctuation, inconsistent capitalization, wrong hyphens). I decided to fix them as I was reading the docs.

Special notes for your reviewer:

Feel free to edit the PR if you are not agreeing to the changes.

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[BoHristova]

Hi @timonegk, thanks for making the Gardener docs better! 🙌

I noticed the recent force-pushes and was wondering whether you're still working on the PR. Do you need some more time before I start reviewing it?

[timonegk]

Hi @BoHristova, thanks for taking a look. I reviewed my changes today and noticed some things I missed. But I think it's ready for your review now. If I see anything else that needs a change, I will add a commit so that you can review them separately.