avcodec: fix doxy placement

libavcodec/avcodec.h

@@ -699,11 +699,11 @@ typedef struct RcOverride{
  * interlaced motion estimation
  */
 #define AV_CODEC_FLAG_INTERLACED_ME   (1 << 29)
+#define AV_CODEC_FLAG_CLOSED_GOP      (1 << 31)
+
 /**
  * Allow non spec compliant speedup tricks.
  */
-#define AV_CODEC_FLAG_CLOSED_GOP      (1 << 31)
-
 #define AV_CODEC_FLAG2_FAST           (1 <<  0)
 /**
  * Skip bitstream encoding.