Removed extra parameter tag in JavaDocs

     * @param proxySpec the global proxy desired. Must be an HTTP Proxy.

     *            Pass Proxy.NO_PROXY to reset the proxy.

     * @param exclusionList a list of domains to be excluded from the global proxy.

     * @param proxyAdmins an empty, mutable list that will contain any proxy admins

     *            that define a global proxy.

     * @return returns null if the proxy was successfully set, or a {@link ComponentName}

     *            of the device admin that sets thew proxy otherwise.

     */