Update more examples inconsistencies (#4711)

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

examples/others/easings_testbed.c

@@ -4,6 +4,8 @@
 *
 *   Example originally created with raylib 2.5, last time updated with raylib 2.5
 *
+*   Example complexity rating: [★★★☆] 3/4
+*
 *   Example contributed by Juan Miguel López (@flashback-fx) and reviewed by Ramon Santamaria (@raysan5)
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/others/embedded_files_loading.c

@@ -2,6 +2,8 @@
 *
 *   raylib [others] example - Embedded files loading (Wave and Image)
 *
+*   Example complexity rating: [★★☆☆] 2/4
+*
 *   Example originally created with raylib 3.0, last time updated with raylib 2.5
 *
 *   Example contributed by Kristian Holmgren (@defutura) and reviewed by Ramon Santamaria (@raysan5)

examples/others/raylib_opengl_interop.c

@@ -2,6 +2,8 @@
 *
 *   raylib [shaders] example - OpenGL point particle system
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   Example originally created with raylib 3.8, last time updated with raylib 2.5
 *
 *   Example contributed by Stephan Soller (@arkanis) and reviewed by Ramon Santamaria (@raysan5)

examples/others/raymath_vector_angle.c

@@ -2,6 +2,8 @@
 *
 *   raylib [shapes] example - Vector Angle
 *
+*   Example complexity rating: [★★☆☆] 2/4
+*
 *   Example originally created with raylib 1.0, last time updated with raylib 4.6
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/others/rlgl_compute_shader.c

@@ -5,6 +5,8 @@
 *   NOTE: This example requires raylib OpenGL 4.3 versions for compute shaders support,
 *         shaders used in this example are #version 430 (OpenGL 4.3)
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   Example originally created with raylib 4.0, last time updated with raylib 2.5
 *
 *   Example contributed by Teddy Astie (@tsnake41) and reviewed by Ramon Santamaria (@raysan5)

examples/others/rlgl_standalone.c

@@ -5,6 +5,8 @@
 *   rlgl library is an abstraction layer for multiple OpenGL versions (1.1, 2.1, 3.3 Core, ES 2.0)
 *   that provides a pseudo-OpenGL 1.1 immediate-mode style API (rlVertex, rlTranslate, rlRotate...)
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   Example originally created with raylib 1.6, last time updated with raylib 4.0
 *
 *   WARNING: This example is intended only for PLATFORM_DESKTOP and OpenGL 3.3 Core profile.