doc: fix makeinfo errors and one warning

commit 4afa50b added few lines that are syntactically incorrect
with leading plus sign.

Cc: Denis Ovsienko <infrastation@yandex.ru>
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>

doc/ipv6.texi

@@ -136,8 +136,8 @@ for the lowest preference possible.
 Default: 0
 @end deffn
 
-+@deffn {Interface Command} {ipv6 nd home-agent-lifetime <0-65520>} {}
-+@deffnx {Interface Command} {no ipv6 nd home-agent-lifetime [<0-65520>]} {}
+@deffn {Interface Command} {ipv6 nd home-agent-lifetime <0-65520>} {}
+@deffnx {Interface Command} {no ipv6 nd home-agent-lifetime [<0-65520>]} {}
 The value to be placed in Home Agent Option, when Home Agent config flag is set, 
 which indicates to hosts Home Agent Lifetime. The default value of 0 means to
 place the current Router Lifetime value.

doc/quagga.texi

@@ -1,13 +1,13 @@
 \input texinfo @c -*- texinfo -*-
+@c Set variables - sourced from defines.texi
+@include defines.texi
+
 @c %**start of header
 @setchapternewpage odd
 @settitle @uref{http://www.quagga.net,,@value{PACKAGE_NAME}}
 @setfilename quagga.info
 @c %**end of header
 
-@c Set variables - sourced from defines.texi
-@include defines.texi
-
 @c automake will automatically generate version.texi
 @c and set EDITION, VERSION, UPDATED and UPDATED-MONTH
 @include version.texi