docs: Change scenario in CHANGES.md to one that works

See #544.

CHANGES.md

@@ -4,20 +4,23 @@ Features added in 3.7.0~rc1
 * B2BUA Media Gateway RTP/SRTP bit pattern testing -- see
   `docs/rtpcheck_xml_syntax_reference.pdf`. Command line examples:
     ```
-    # UAC (RTP)
-    ./sipp -m 1 -sf sipp_scenarios/pfca_uac_apattern.xml \
-      -t u1 -i 127.0.0.2 -p 5060 127.0.0.3:5060
     # UAS (RTP)
     ./sipp -m 1 -sf sipp_scenarios/pfca_uas.xml \
       -i 127.0.0.3 -t u1 -p 5060 -rtp_echo
 
-    # UAC (SRTP)
-    ./sipp -m 1 -sf sipp_scenarios/pfca_uac_bpattern_crypto_simple.xml \
+    # UAC (RTP)
+    ./sipp -m 1 -sf sipp_scenarios/pfca_uac_apattern.xml \
+      -t u1 -i 127.0.0.2 -p 5060 127.0.0.3:5060
+    ```
+    ```
+    # UAS (audio SRTP)
+    ./sipp -m 1 -sf sipp_scenarios/pfca_uas_audio_crypto_simple.xml \
+      -t u1 -i 127.0.0.3 -p 5060 -srtpcheck_debug
+
+    # UAC (audio SRTP)
+    ./sipp -m 1 -sf sipp_scenarios/pfca_uac_apattern_crypto_simple.xml \
       -t u1 -i 127.0.0.2 -p 5060 -rtpcheck_debug -srtpcheck_debug \
       127.0.0.3:5060
-    # UAS (SRTP)
-    ./sipp -m 1 -sf sipp_scenarios/pfca_uas_both_crypto_simple.xml \
-      -t u1 -i 127.0.0.3 -p 5060 -srtpcheck_debug
     ```
   By Jeannot Langlois.
 * Removed `-mp` in favor of `-min_rtp_port` and `-max_rtp_port`. Also