[master] Added hooks.xml to DOCBOOK

doc/guide/Makefile.am

@@ -6,7 +6,7 @@ dist_doc_DATA = $(DOCS)
 dist_html_DATA = $(HTMLDOCS) kea-guide.css
 
 DOCBOOK = kea-guide.xml intro.xml quickstart.xml install.xml admin.xml config.xml
-DOCBOOK += keactrl.xml dhcp4-srv.xml dhcp6-srv.xml logging.xml ddns.xml
+DOCBOOK += keactrl.xml dhcp4-srv.xml dhcp6-srv.xml logging.xml ddns.xml hooks.xml
 DOCBOOK += libdhcp.xml
 
 EXTRA_DIST = $(DOCBOOK)