Update hook descriptions

snippets/useInterval.md

@@ -3,12 +3,12 @@ title: useInterval
 tags: hooks,effect,intermediate
 ---
 
-A hook that implements `setInterval` in a declarative manner.
+Implements `setInterval` in a declarative manner.
 
 - Create a custom hook that takes a `callback` and a `delay`.
-- Use the `React.useRef()` hook to create a `ref` for the callback function.
-- Use the `React.useEffect()` hook to remember the latest callback.
-- Use the `React.useEffect()` hook to set up the interval and clean up.
+- Use the `useRef()` hook to create a `ref` for the callback function.
+- Use a `useEffect()` hook to remember the latest `callback` whenever it changes.
+- Use a `useEffect()` hook dependent on `delay` to set up the interval and clean up.
 
 ```jsx
 const useInterval = (callback, delay) => {