doc: add release note for bitcoin#31130

AreaLayer · Oct 25, 2024 · b7b2435 · b7b2435
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+P2P and network changes
+-----------------------
+
+Support for UPnP was dropped. If you want to open a port automatically, consider using the `-natpmp`
+option instead, which uses PCP or NAT-PMP depending on router support.
+
+Updated settings
+------
+
+- Setting `-upnp` will now return an error. Consider using `-natpmp` instead.