Update more examples inconsistencies (#4711)

Co-authored-by: Anstro Pleuton <anstropleuton@github.com>

examples/shaders/shaders_vertex_displacement.c

@@ -2,6 +2,8 @@
 *
 *   raylib [shaders] example - Vertex displacement
 *
+*   Example complexity rating: [★★★☆] 3/4
+*
 *   Example originally created with raylib 5.0, last time updated with raylib 4.5
 *
 *   Example contributed by Alex ZH (@ZzzhHe) and reviewed by Ramon Santamaria (@raysan5)