gpu: Added small description to gpu files.

libctru/source/gpu/gpu.c

@@ -1,3 +1,7 @@
+/*
+  gpu.c _ Advanced GPU commands.
+*/
+
 #include <stdlib.h>
 #include <string.h>
 #include <3ds/types.h>

libctru/source/gpu/shdr.c

@@ -1,3 +1,7 @@
+/*
+  shdr.c _ Shader loader.
+*/
+
 #include <stdlib.h>
 #include <string.h>
 #include <3ds/types.h>

libctru/source/services/gsp.c

@@ -1,3 +1,7 @@
+/*
+  gsp.c _ Gpu/lcd stuff.
+*/
+
 #include <stdlib.h>
 #include <string.h>
 #include <3ds/types.h>
@@ -18,6 +22,7 @@ static vu8* gspEventData;
 
 static void gspEventThreadMain(u32 arg);
 
+
 Result gspInit()
 {
 	return srvGetServiceHandle(&gspGpuHandle, "gsp::Gpu");

libctru/source/services/gx.c

@@ -1,3 +1,7 @@
+/*
+  gx.c _ Sending GPU requests via GSP shared memory.
+*/
+
 #include <stdlib.h>
 #include <3ds/types.h>
 #include <3ds/GSP.h>