* Updated strict-mode docs to use UNSAFE_ method names
The strict mode docs still reference the old `componentWill*` lifecycle method names, this updates them to be `UNSAFE_componentWill*`
* Tweaked docs to mention both unsafe lifecycle names
Co-authored-by: Brian Vaughn <brian.david.vaughn@gmail.com>
We might want to open an RFC for fragment refs which could solve the one
remaining use case in a better way but at least let us get the deprecation
in.