avutil/adler32: add Doxy group

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavutil/adler32.c

@@ -21,6 +21,15 @@
  * 3. This notice may not be removed or altered from any source distribution.
  */
 
+/**
+ * @file
+ * Computes the Adler-32 checksum of a data stream
+ *
+ * This is a modified version based on adler32.c from the zlib library.
+ * @author Mark Adler
+ * @ingroup lavu_adler32
+ */
+
 #include "config.h"
 #include "adler32.h"
 #include "common.h"

libavutil/adler32.h

@@ -25,6 +25,9 @@
 #include "attributes.h"
 
 /**
+ * @file
+ * Public header for libavutil Adler32 hasher
+ *
  * @defgroup lavu_adler32 Adler32
  * @ingroup lavu_crypto
  * @{