Fix typo (#3998)

Author: itaileshem

Diff for: beta/src/pages/learn/rendering-lists.md

@@ -419,7 +419,7 @@ On this page you learned:
 
 * How to move data out of components and into data structures like arrays and objects.
 * How to generate sets of similar components with JavaScript's `map()`.
-* How to create arrays of filtered items with Javascript's `filter()`.
+* How to create arrays of filtered items with JavaScript's `filter()`.
 * Why and how to set `key` on each component in a collection so React can keep track of each of them even if their position or data changes.
 
 </Recap>