[hooks] - edit hooks FAQ , react devtools and flow support react hooks

[Avi98]

In hooks FAQ Do Hooks cover all use cases for classes says that there is no support for hooks in devtools and flowtype.
But thanks to @bvaughn, he has added hooks support in react devtools and flowtype

[bvaughn]

cc @gaearon maybe we can amend this statement as part of writing the blog post for the next release?

[Avi98]

I can raise a PR and then it can be merged in the next release if its okay

[bvaughn]

Dan was already planning on updating those docs as part of our upcoming release process, so you'll want to coordinate with him to avoid conflicts. 😄 I'll let you two sort it out. Thanks for the offer either way!