lib/igt_aux: api documentation

I'm not really happy with the name of the igt_env_set function, I'll
follow up with a patch to change it.

Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

lib/intel_os.c

@@ -51,6 +51,12 @@
 #include "drmtest.h"
 #include "igt_aux.h"
 
+/**
+ * intel_get_total_ram_mb:
+ *
+ * Returns:
+ * The total amount of system RAM available in MB.
+ */
 uint64_t
 intel_get_total_ram_mb(void)
 {
@@ -79,6 +85,12 @@ intel_get_total_ram_mb(void)
 	return retval / (1024*1024);
 }
 
+/**
+ * intel_get_total_swap_mb:
+ *
+ * Returns:
+ * The total amount of swap space available in MB.
+ */
 uint64_t
 intel_get_total_swap_mb(void)
 {