small typo in IP_ADDPRESS_OF_YOUR_PI_HOLE; two minor copy tweaks

[Homesteady]

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What does this PR aim to accomplish?:

README edits only

What documentation changes (if any) are needed to support this PR?:

That's the entirety of the change, in fact!

[yubiuser]

Thanks for your contribution.

[pralor-bot]

This pull request has been mentioned on Pi-hole Userspace. There might be relevant details there:

https://discourse.pi-hole.net/t/pi-hole-ftl-v5-12-web-v5-9-and-core-v5-7-released/51795/1