Update documentation for examples.

examples/simple_enumeration.c

@@ -1,3 +1,12 @@
+/*
+Demonstrates how to enumerate over devices.
+
+Device enumaration requires a `ma_context` object which is initialized with `ma_context_init()`. Conceptually, the
+context sits above a device. You can have many devices to one context.
+
+If you use device enumeration, you should explicitly specify the same context you used for enumeration in the call to
+`ma_device_init()` when you initialize your devices.
+*/
 #define MINIAUDIO_IMPLEMENTATION
 #include "../miniaudio.h"