fix: remove duplicated our (#1)

Author: kewinzaq1

exercises/01.use-state/03.problem.re-render/README.mdx

@@ -6,7 +6,7 @@ updated. Remember, we're not React. We need to tell React when the state has
 changed so it will render our component again.
 
 Because we're not React, the way we will do this is by simply calling `render`
-our our root again. Remember what the bottom of our file looks like?
+our root again. Remember what the bottom of our file looks like?
 
 ```tsx lines=4
 const rootEl = document.createElement('div')