Add missing @throws.

git-svn-id: https://svn.apache.org/repos/asf/commons/proper/codec/trunk@1744621 13f79535-47bb-0310-9956-ffa450edef68

Author: garydgregory

src/main/java/org/apache/commons/codec/digest/DigestUtils.java

@@ -1072,6 +1072,8 @@ public DigestUtils update(final String data) {
      * @param data
      *            the data to update the {@link MessageDigest} with
      * @return the updated {@link DigestUtils}
+     * @throws IOException
+     *             If some I/O error occurs.
      * @since 1.11
      */
     public DigestUtils update(final InputStream data) throws IOException {
@@ -1091,6 +1093,10 @@ public DigestUtils update(final InputStream data) throws IOException {
      * @param data
      *            the data to update the {@link MessageDigest} with
      * @return the updated {@link DigestUtils}
+     * @throws IOException
+     *             If some I/O error occurs.
+     * @throws SecurityException
+     *             if a security manager exists and its {@code checkRead} method denies read access to the file.
      * @since 1.11
      */
     public DigestUtils update(final File data) throws IOException {