Documentation for Class<T>, $PropertyType<T, x>, $Exact<T>, and *
Documentation for Class<T>, $PropertyType<T, x>, $Exact<T>, and *

Summary:
Ref: #2464
Closes https://github.com/facebook/flow/pull/2983

Reviewed By: gabelevi

Differential Revision: D4401030

Pulled By: samwgoldman

fbshipit-source-id: 9411d762e307d97c56b80005c00d866f1fc74eed

gabelevi/flow,gabelevi/flow,samwgoldman/flow,nmote/flow,claudiopro/flow,TiddoLangerak/flow,gabro/flow,facebook/flow,AgentME/flow,mroch/flow,jamesgpearce/flow,jamesgpearce/flow,mroch/flow,gabelevi/flow,JonathanUsername/flow,samwgoldman/flow,mroch/flow,fletcherw/flow,facebook/flow,AgentME/flow,ylu1317/flow,claudiopro/flow,JonathanUsername/flow,fletcherw/flow,claudiopro/flow,popham/flow,fletcherw/flow,popham/flow,fletcherw/flow,facebook/flow,MichaelDeBoey/flow,claudiopro/flow,gabro/flow,gabelevi/flow,gabelevi/flow,AgentME/flow,popham/flow,JonathanUsername/flow,jamesgpearce/flow,facebook/flow,ylu1317/flow,popham/flow,JonathanUsername/flow,nmote/flow,nmote/flow,jamesgpearce/flow,nmote/flow,gabelevi/flow,fletcherw/flow,nmote/flow,samwgoldman/flow,AgentME/flow,JonathanUsername/flow,claudiopro/flow,jamesgpearce/flow,samwgoldman/flow,mroch/flow,jamesgpearce/flow,MichaelDeBoey/flow,mroch/flow,facebook/flow,MichaelDeBoey/flow,samwgoldman/flow,popham/flow,facebook/flow,ylu1317/flow,mroch/flow,gabro/flow,TiddoLangerak/flow,mroch/flow,gabro/flow,popham/flow,gabro/flow,samwgoldman/flow,nmote/flow,MichaelDeBoey/flow,TiddoLangerak/flow,TiddoLangerak/flow,ylu1317/flow,gabro/flow,samwgoldman/flow,TiddoLangerak/flow,jamesgpearce/flow,gabelevi/flow,popham/flow,MichaelDeBoey/flow,nmote/flow,JonathanUsername/flow,ylu1317/flow,AgentME/flow,facebook/flow,fletcherw/flow,JonathanUsername/flow