Add linebreak

Author: gaearon

beta/src/pages/apis/usecontext.md

@@ -24,6 +24,8 @@ const value = useContext(SomeContext)
   - [My component doesn't see the value from my provider](#my-component-doesnt-see-the-value-from-my-provider)
   - [I am always getting undefined from my context although the default value is different](#i-am-always-getting-undefined-from-my-context-although-the-default-value-is-different)
 
+---
+
 ## Usage {/*usage*/}
 
 

beta/src/pages/apis/useref.md

@@ -22,6 +22,8 @@ const ref = useRef(initialValue)
 - [Troubleshooting](#troubleshooting)
   - [I can’t get a ref to a custom component](#i-cant-get-a-ref-to-a-custom-component)
 
+---
+
 ## Usage {/*usage*/}
 
 ### Referencing a value with a ref {/*referencing-a-value-with-a-ref*/}