feat(ios,android,web): add option to allow auto-correction away from valid words in predictive text

[mcdurdin]

One long-time pet peeve of mine when it comes to auto-correct: it should never correct away from a perfectly-valid word of the language. Even if it's is a more common word in English than its, I believe that its should be left in place. (I find it quite the pain on iOS, as I've had to fight iOS to leave its before.)

Interestingly, I've seen other users who love this. its vs it's is impossible to get right without some grammatical awareness of course... but in the more general case, I wonder if this should be surfaced as an option for users?

Originally posted by @mcdurdin in #11876 (comment)