Add comment about RGB formats which are often flipped in memory.

Thx@ Squarefox for reporting.

git-svn-id: svn://svn.code.sf.net/p/irrlicht/code/trunk@5115 dfc29bdd-3216-0410-991c-e03cc46cb475

include/SColor.h

@@ -13,7 +13,10 @@ namespace irr
 namespace video
 {
 	//! An enum for the color format of textures used by the Irrlicht Engine.
-	/** A color format specifies how color information is stored. */
+	/** A color format specifies how color information is stored. 
+	    NOTE: Byte order in memory is usually flipped (it's probably correct in bitmap files, but flipped on reading).
+	    So for example ECF_A8R8G8B8 is BGRA in memory same as in DX9's D3DFMT_A8R8G8B8 format.
+	*/
 	enum ECOLOR_FORMAT
 	{
 		//! 16 bit color format used by the software driver.