Dan Do

I see that we don't have documentation still, do we want to? I can grab it if we still do

Actually I think this can be closed? setModifierManager only exists in https://github.com/emberjs/ember.js/blob/11ec39fe49bfccfdfabedab8aaded2d439070a21/packages/%40ember/modifier/index.ts#L10 And [setComponentManager](https://github.com/emberjs/ember.js/blob/11ec39fe49bfccfdfabedab8aaded2d439070a21/packages/%40ember/-internals/glimmer/lib/utils/managers.ts#L7) already has documentation