update examples with difficulty stars (#4694)

* update examples with difficulty stars

* manual fix script issues

* manual fix script issues

examples/audio/audio_mixed_processor.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Mixed audio processing
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   Example originally created with raylib 4.2, last time updated with raylib 4.2
 *
 *   Example contributed by hkc (@hatkidchan) and reviewed by Ramon Santamaria (@raysan5)

examples/audio/audio_module_playing.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Module playing (streaming)
 *
+*   Example complexity rating: [★☆☆☆] 1/4
+*
 *   Example originally created with raylib 1.5, last time updated with raylib 3.5
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/audio/audio_music_stream.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Music playing (streaming)
 *
+*   Example complexity rating: [★☆☆☆] 1/4
+*
 *   Example originally created with raylib 1.3, last time updated with raylib 4.0
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/audio/audio_raw_stream.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Raw audio streaming
 *
+*   Example complexity rating: [★★★☆] 3/4
+*
 *   Example originally created with raylib 1.6, last time updated with raylib 4.2
 *
 *   Example created by Ramon Santamaria (@raysan5) and reviewed by James Hofmann (@triplefox)

examples/audio/audio_sound_loading.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Sound loading and playing
 *
+*   Example complexity rating: [★☆☆☆] 1/4
+*
 *   Example originally created with raylib 1.1, last time updated with raylib 3.5
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/audio/audio_sound_multi.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Playing sound multiple times
 *
+*   Example complexity rating: [★★☆☆] 2/4
+*
 *   Example originally created with raylib 4.6
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,

examples/audio/audio_stream_effects.c

@@ -2,6 +2,8 @@
 *
 *   raylib [audio] example - Music stream processing effects
 *
+*   Example complexity rating: [★★★★] 4/4
+*
 *   Example originally created with raylib 4.2, last time updated with raylib 5.0
 *
 *   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,