Update _sidebar.md

Author: TheNachoBIT

Diff for: _sidebar.md

@@ -3,4 +3,4 @@
 	* [Chapter 1.1: The Terminal](Book/Chapter1/1.md)
 	* [Chapter 1.2: First Steps](Book/Chapter1/2.md)
 	* [Chapter 1.3: The First Project](Book/Chapter1/3.md)
-	* [Chapter 1.4: Commands for Everything](Book/Chapter1/4.md)
+	* [Chapter 1.4: The Command for Everything](Book/Chapter1/4.md)