Fixed various spelling errors. Co-authored-by: Josh Soref <jsoref@users.noreply.github.com>
It seems more consistent and unambiguous if we mark RFCs as being implemented when the implementation lands instead of expecting to cross-reference documentation. That also makes it easier for us to flag stale RFCs.
This is going to apply to language and core library changes and will supplant the internal Roblox API proposal process for Luau only.