usdRi → usd Relation

File in pxr/usd/usdRi	Includes file in pxr/usd/usd
materialAPI.h	apiSchemaBase.h
materialAPI.h	prim.h
materialAPI.h	stage.h
splineAPI.h	apiSchemaBase.h
splineAPI.h	prim.h
splineAPI.h	stage.h
statementsAPI.h	apiSchemaBase.h
statementsAPI.h	prim.h
statementsAPI.h	stage.h