lavu/pixfmt: fix redundant comment

Mistake introduced in a1f6b1d9d8.

libavutil/pixfmt.h

@@ -412,7 +412,7 @@ enum AVColorPrimaries {
     AVCOL_PRI_SMPTE428    = 10, ///< SMPTE ST 428-1 (CIE 1931 XYZ)
     AVCOL_PRI_SMPTEST428_1 = AVCOL_PRI_SMPTE428,
     AVCOL_PRI_SMPTE431    = 11, ///< SMPTE ST 431-2 (2011) / DCI P3
-    AVCOL_PRI_SMPTE432    = 12, ///< SMPTE ST 432-1 D65 (2010) / P3 D65 / Display P3
+    AVCOL_PRI_SMPTE432    = 12, ///< SMPTE ST 432-1 (2010) / P3 D65 / Display P3
     AVCOL_PRI_NB                ///< Not part of ABI
 };