Update more examples inconsistencies (#4711)

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

examples/textures/textures_image_channel.c

@@ -4,6 +4,8 @@
 *
 *   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
 *
+*   Example complexity rating: [★★☆☆] 2/4
+*
 *   Example originally created with raylib 5.1-dev, last time updated with raylib 5.1-dev
 *
 *   Example contributed by Bruno Cabral (@brccabral) and reviewed by Ramon Santamaria (@raysan5)

examples/textures/textures_image_kernel.c

@@ -2,6 +2,8 @@
 *
 *   raylib [textures] example - Image loading and texture creation
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   NOTE: Images are loaded in CPU memory (RAM); textures are loaded in GPU memory (VRAM)
 *
 *   Example contributed by Karim Salem (@kimo-s) and reviewed by Ramon Santamaria (@raysan5)

examples/textures/textures_image_rotate.c

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

examples/textures/textures_polygon.c

@@ -6,12 +6,12 @@
 *
 *   Example originally created with raylib 3.7, last time updated with raylib 3.7
 *
-*   Example contributed by Chris Camacho (@codifies) and reviewed by Ramon Santamaria (@raysan5)
+*   Example contributed by Chris Camacho (@chriscamacho) and reviewed by Ramon Santamaria (@raysan5)
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
 *   BSD-like license that allows static linking with closed source software
 *
-*   Copyright (c) 2021-2025 Chris Camacho (@codifies) and Ramon Santamaria (@raysan5)
+*   Copyright (c) 2021-2025 Chris Camacho (@chriscamacho) and Ramon Santamaria (@raysan5)
 *
 ********************************************************************************************/