Update documentation for examples.

examples/simple_looping.c

@@ -1,3 +1,10 @@
+/*
+Shows one way to handle looping of a sound.
+
+This example uses a decoder as the data source. Decoders can be used with the `ma_data_source` API which, conveniently,
+supports looping via the `ma_data_source_read_pcm_frames()` API. To use it, all you need to do is pass a pointer to the
+decoder straight into `ma_data_source_read_pcm_frames()` and it will just work.
+*/
 #define MINIAUDIO_IMPLEMENTATION
 #include "../miniaudio.h"