Doc change for prevContext removal in CDU (#10836)

* Doc change for prevContext removal in CDU

Ref: #8631

* Minor rewording

Author: STRML

docs/docs/context.md

@@ -153,7 +153,8 @@ If `contextTypes` is defined within a component, the following [lifecycle method
 - [`componentWillReceiveProps(nextProps, nextContext)`](/react/docs/react-component.html#componentwillreceiveprops)
 - [`shouldComponentUpdate(nextProps, nextState, nextContext)`](/react/docs/react-component.html#shouldcomponentupdate)
 - [`componentWillUpdate(nextProps, nextState, nextContext)`](/react/docs/react-component.html#componentwillupdate)
-- [`componentDidUpdate(prevProps, prevState, prevContext)`](/react/docs/react-component.html#componentdidupdate)
+
+> Note: As of React 16, `componentDidUpdate` no longer receives `prevContext`.
 
 ## Referencing Context in Stateless Functional Components