Update README.md

Author: m3y54m

README.md

@@ -864,7 +864,7 @@ Digital signal processing (DSP) is a branch of engineering that deals with the p
 - [🔘 The FFT Algorithm - Simple Step by Step](https://www.youtube.com/watch?v=htCj9exbGo0)
 - [🔘 STM32 Fast Fourier Transform (CMSIS DSP FFT) - Phil's Lab #111](https://youtu.be/d1KvgOwWvkM)
 
-### ✳️ Controls Theory
+### ✳️ Control Theory
 
 - [🔘 Understanding Control Systems (YouTube Playlist)](https://youtube.com/playlist?list=PLn8PRpmsu08q8CE0pbZ-cSrMm_WYJfVGd)
 - [🔘 Control Systems - CircuitBread (YouTube Playlist)](https://www.youtube.com/playlist?list=PLfYdTiQCV_p4YZNJWExM-5_g0fk9bHDL8)