Fix grammar (#2676)

content/docs/hooks-reference.md

@@ -143,7 +143,7 @@ Although `useEffect` is deferred until after the browser has painted, it's guara
 
 The default behavior for effects is to fire the effect after every completed render. That way an effect is always recreated if one of its dependencies changes.
 
-However, this may be overkill in some cases, like the subscription example from the previous section. We don't need to create a new subscription on every update, only if the `source` props has changed.
+However, this may be overkill in some cases, like the subscription example from the previous section. We don't need to create a new subscription on every update, only if the `source` prop has changed.
 
 To implement this, pass a second argument to `useEffect` that is the array of values that the effect depends on. Our updated example now looks like this: