modules: readme files regenerated - sdpops ... [skip ci]

src/modules/sdpops/README

@@ -529,6 +529,8 @@ if(is_method("INVITE") && has_body("application/sdp")){
      * $sdp(sess_version) - sess-version -attribute from SDP o= -line.
        When set to special value -1, current value is incremented. (read +
        write)
+     * $sdp(c:ip) - connection IP (read only) - taken from first media
+       strea if specified, otherwise from first session.
 
    Exported pseudo-variables are also documented at
    https://www.kamailio.org/wikidocs/