doc: Fix overfull hboxes errors that cause PDF build to return fail

* overfull hboxes cause texi2dvi to return fail, even if the PDf is written.
  We hacked around this by running it with '...  || true', but that
  sucks for buildboting the docs.

  Fix all the overfull hboxes.

* ospfd.texi: Long command definitions can cause hbox overruns in the
  columnar command definitions index.  This leads to strange errors
  about "Missing number, treated as zero." when building the index -
  very hard to figure out.

  'show ip ospf database ...' was the culprit.  Use a distinct deffnx
  alias for each option instead of trying to stuff them into 1 line.
diff --git a/doc/nhrpd.texi b/doc/nhrpd.texi
index 6caf5a6..71d1ce9 100644
--- a/doc/nhrpd.texi
+++ b/doc/nhrpd.texi
@@ -91,8 +91,9 @@
 @group
 iptables -A FORWARD -i gre1 -o gre1 \
 	-m hashlimit --hashlimit-upto 4/minute --hashlimit-burst 1 \
-	--hashlimit-mode srcip,dstip --hashlimit-srcmask 24 --hashlimit-dstmask 24 \
-	--hashlimit-name loglimit-0 -j NFLOG --nflog-group 1 --nflog-range 128
+	--hashlimit-mode srcip,dstip --hashlimit-srcmask 24 \
+	--hashlimit-dstmask 24 --hashlimit-name loglimit-0 \
+	-j NFLOG --nflog-group 1 --nflog-range 128
 @end group
 @end example