docs/Maintainer-Guidelines: add mission.

[MikeMcQuaid]

@zbeekman mentioned this would be good to add to the docs but didn't get around to it.

@Homebrew/maintainers any thoughts on this are welcome.

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[vitorgalvao]

It's → Its.

Suggested change

	Homebrew seeks to be the missing package manager for macOS. It's primary goal is to be useful. It should be as useful as possible to as many people as possible that we can maintain as a small group of volunteers to a commercially high standard. Where possible and sensible it should seek to use macOS features and blend in with the macOS and Apple ecosystem.
	Homebrew seeks to be the missing package manager for macOS. Its primary goal is to be useful. It should be as useful as possible to as many people as possible that we can maintain as a small group of volunteers to a commercially high standard. Where possible and sensible it should seek to use macOS features and blend in with the macOS and Apple ecosystem.

[vitorgalvao]

The third sentence reads weird to me. I understand the meaning, but I feel some non-native english speakers might be confused. It’s the “that” connector that’s tripping me up, I think.

Also, might it me wise to remove the “commercially”? On commercial apps support is supposed to always be nice, even if the customer is rude. Here we typically warn/ask users to be more civil and may even ban them if they’re irredeemably difficult.

[Moisan]

✋Non-native english speaker here. I am confused by the third sentence. How about
It should be as useful as possible to as many people as possible while being maintained by a small group of volunteers to a commercially high standard.

[zbeekman]

Suggested change

	Homebrew seeks to be the missing package manager for macOS. It's primary goal is to be useful. It should be as useful as possible to as many people as possible that we can maintain as a small group of volunteers to a commercially high standard. Where possible and sensible it should seek to use macOS features and blend in with the macOS and Apple ecosystem.
	Homebrew seeks to be the missing package manager for macOS. Its primary goal is to be useful. It should be as useful as possible to as many people as possible while remaining maintainable by a small group of volunteers to a commercially high standard. Where possible and sensible it should seek to use macOS features and blend in with the macOS and Apple ecosystem.

Native English speaker here, and, yes, I agree the third sentence needs re-wording. Sorry for dropping the ball on this @MikeMcQuaid and thanks for adding it!

@Moisan I've adapted your suggestion a bit
@vitorgalvao I've included your suggested edit in my suggested edit

[MikeMcQuaid]

I believe I'd addressed pretty much all feedback here so 🚢. Thanks everyone for the help and feedback ❤️