Intent to ship: autocorrect HTML attribute

[Makoto Kato]

Summary:
By bug 1725806, I have implemented the autocorrect attribute in Nightly.
Other browsers have shipped with partial or full support for this
feature, so I would like to ship this in Firefox.

Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1927977
Specification: https://html.spec.whatwg.org/#autocorrection
Standards Body: WHATWG
Platform coverage: All. Android and macOS have backend implementations.
Preference: dom.forms.autocorrect
DevTools: Not needed
Other browsers:
Blink: Shipped HTML attribute only. No DOM property yet.
WebKit: Shipped.
web-platform-tests:
https://wpt.fyi/results/html/editing/editing-0/autocorrection