Port everything over to AsXml

parsers/src/jingle_rtcp_fb.rs

@@ -4,12 +4,12 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use xso::{FromXml, IntoXml};
+use xso::{AsXml, FromXml};
 
 use crate::ns;
 
 /// Wrapper element for a rtcp-fb.
-#[derive(FromXml, IntoXml, PartialEq, Debug, Clone)]
+#[derive(FromXml, AsXml, PartialEq, Debug, Clone)]
 #[xml(namespace = ns::JINGLE_RTCP_FB, name = "rtcp-fb")]
 pub struct RtcpFb {
     /// Type of this rtcp-fb.