Update more examples inconsistencies (#4711)

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

examples/models/models_bone_socket.c

@@ -1,6 +1,8 @@
 /*******************************************************************************************
 *
 *   raylib [core] example - Using bones as socket for calculating the positioning of something
+*
+*   Example complexity rating: [★★★★] 4/4
 * 
 *   Example originally created with raylib 4.5, last time updated with raylib 4.5
 *

examples/models/models_gpu_skinning.c

@@ -1,6 +1,8 @@
 /*******************************************************************************************
 *
 *   raylib [core] example - Doing skinning on the gpu using a vertex shader
+*
+*   Example complexity rating: [★★★☆] 3/4
 * 
 *   Example originally created with raylib 4.5, last time updated with raylib 4.5
 *

examples/models/models_point_rendering.c

@@ -2,6 +2,8 @@
 *
 *   raylib example - point rendering
 *
+*   Example complexity rating: [★★★☆] 3/4
+*
 *   Example originally created with raylib 5.0, last time updated with raylib 5.0
 *
 *   Example contributed by Reese Gallagher (@satchelfrost) and reviewed by Ramon Santamaria (@raysan5)

examples/models/models_tesseract_view.c

@@ -4,6 +4,8 @@
 *
 *   NOTE: This example only works on platforms that support drag & drop (Windows, Linux, OSX, Html5?)
 *
+*   Example complexity rating: [★★☆☆] 2/4
+*
 *   Example originally created with raylib 5.6-dev, last time updated with raylib 5.6-dev
 *
 *   Example contributed by Timothy van der Valk (@arceryz) and reviewed by Ramon Santamaria (@raysan5)