replace Generic with TParam
replace Generic with TParam

Summary: This case had slipped through the cracks earlier when `TParam` was introduced.

Reviewed By: samwgoldman

Differential Revision: D7310633

fbshipit-source-id: babb1250d9980d333873d7974427541f647f5358

AgentME/flow,AgentME/flow,jamesgpearce/flow,popham/flow,samwgoldman/flow,facebook/flow,JonathanUsername/flow,gabelevi/flow,samwgoldman/flow,nmote/flow,nmote/flow,samwgoldman/flow,popham/flow,facebook/flow,mroch/flow,JonathanUsername/flow,jamesgpearce/flow,mroch/flow,popham/flow,JonathanUsername/flow,gabelevi/flow,JonathanUsername/flow,jamesgpearce/flow,nmote/flow,nmote/flow,facebook/flow,jamesgpearce/flow,popham/flow,nmote/flow,jamesgpearce/flow,nmote/flow,mroch/flow,facebook/flow,AgentME/flow,mroch/flow,claudiopro/flow,popham/flow,gabelevi/flow,gabelevi/flow,samwgoldman/flow,mroch/flow,mroch/flow,AgentME/flow,samwgoldman/flow,popham/flow,facebook/flow,facebook/flow,nmote/flow,claudiopro/flow,claudiopro/flow,claudiopro/flow,samwgoldman/flow,claudiopro/flow,mroch/flow,gabelevi/flow,facebook/flow,JonathanUsername/flow,gabelevi/flow,JonathanUsername/flow,popham/flow,samwgoldman/flow,jamesgpearce/flow,AgentME/flow,jamesgpearce/flow,gabelevi/flow,JonathanUsername/flow