Updated Working on GNU Linux (markdown)

Working-on-GNU-Linux.md

@@ -320,7 +320,7 @@ all:
 ## The simplest possible build command
 After installing raylib from source or package manager, you can build a project with this command (modify as necessary):
 ```
-cc game.c -lraylib -lGL -lm -lpthread -ldl -lrt -lX11
+gcc game.c -lraylib -lGL -lm -lpthread -ldl -lrt -lX11
 ```
 Creating a Makefile will help with building as the project grows.