If you want auto-correct, you should use it client-side. Server-side auto-correct is very close to censoring, which shouldn't happen.
While bitcointalk will never censor comments made, it goes against the freedom bitcointalk provides. Censorship only occurs in fully regulated types of forums or social media. In the case of censorship, profanities may be replaced with Asterisks, etc LOL.
Proofreading helps a lot too: Preview your post and read it again before you submit it.
The post preview that has been provided is helpful enough to do a review once again before publishing it.
Auto-correction only exists on client-side applications and will never be implemented on bitcointalk servers.