Document MatchTrue, MatchFalse and MatchCondition readiness checks

[LCaparelli]

Companion for crossplane/crossplane#4399

I noticed MatchCondition was not yet documented. If this was intentional or if you'd rather it in a separate PR just let me know :-)

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[plumbis]

This is fantastic, thank you so much for the docs PR! A few nits to improve wording and pass Vale CI checks.

[LCaparelli]

Ah thank you @plumbis, that's my bad, I forgot to run the checks locally 😅

I'll commit fixes shortly.

[phisco]

@LCaparelli, gentle reminder 😅

[LCaparelli]

@LCaparelli, gentle reminder 😅

Thanks hehe, just got back from vacation and this one escaped my final wrapping up process before disappearing 😁