docs: Prepare release notes for version 0.3.0

Change-Id: If0ae14cbf97ee3d9b92a3467d0b6592c10e66698
Refs: #2462, #2352, #2209
diff --git a/docs/manpages.rst b/docs/manpages.rst
index 6a52897..4d8ee12 100644
--- a/docs/manpages.rst
+++ b/docs/manpages.rst
@@ -12,6 +12,7 @@
    manpages/nfd-status-http-server
    manpages/ndn-autoconfig
    manpages/ndn-autoconfig-server
+   misc/local-prefix-discovery
    manpages/nfd-autoreg
    manpages/ndn-tlv-peek
    manpages/ndn-tlv-poke