Add PR #1231 to changelog.

Author: tmiw

USER_MANUAL.md

@@ -883,6 +883,7 @@ LDPC | Low Density Parity Check Codes - a family of powerful FEC codes
     * Update audio device list in Easy Setup after opening advanced audio setup. (PR #1223)
     * Easy Setup: Fix crash while displaying Hamlib error. (PR #1224)
     * Force numpy to 2.3.x due to illegal instruction errors. (PR #1230)
+    * FreeDV Reporter: Disable autosizing enable/disable on Linux. (PR #1231)
 2. Enhancements:
     * FreeDV Reporter: Use ItemsAdded/ItemsDeleted instead of Cleared() for performance. (PR #1212)
 3. Build system: