Document av_gcd().

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@20935 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/mathematics.h

@@ -56,6 +56,11 @@ enum AVRounding {
     AV_ROUND_NEAR_INF = 5, ///< Round to nearest and halfway cases away from zero.
 };
 
+/**
+ * Returns the greatest common divisor of a and b.
+ * If either a or b are 0 or either or both are <0 then behavior is
+ * undefined.
+ */
 int64_t av_const av_gcd(int64_t a, int64_t b);
 
 /**