updating DIRECTORY.md

Author: github-actions

DIRECTORY.md

@@ -113,7 +113,7 @@
   * [ReverseString](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseString.js)
   * [ReverseWords](https://github.com/TheAlgorithms/Javascript/blob/master/String/ReverseWords.js)
 
-## Timing Functions
+## TimingFunctions
   * [IntervalTimer](https://github.com/TheAlgorithms/Javascript/blob/master/TimingFunctions/IntervalTimer.js)
 
 ## Trees