Update README.md

Author: sh123

extras/schematics/README.md

@@ -7,6 +7,6 @@ Suitable for two different narrower ESP32 devkit board types with different pino
 
 Pinout configuration is done via solder pads.
 
-⚠ **There are ESP32 boards with different socket widths: 22mm and 25mm, board files for 25mm have _wide siffux in file names.**
+⚠ **There are ESP32 boards with different socket widths: 22mm and 25mm, board files for 25mm have _wide suffix in file names.**
 
 ![Board](../images/board.png)