Updated _Sidebar (markdown)

_Sidebar.md

@@ -3,7 +3,7 @@
 ## Library Design
 * [raylib architecture](raylib-architecture)
 * [raylib data structures](raylib-data-structures)
-* [raylib external dependencies](raylib-external-dependencies)
+* [raylib external dependencies](raylib-dependencies)
 * [raylib platforms and graphics](raylib-platforms-and-graphics)
 * [raylib internal buffers](raylib-internal-buffers-(2D-vs-3D))
 * [raylib custom shaders](raylib-generic-uber-shader-and-custom-shaders)