Fix texinfo files for makeinfo-5.1

* doc/ref/api-options.texi: Move "Debugger options" in the menu.
* doc/ref/api-utility.texi (Handling Scheme-level hooks from C code):
  Turn into a @subsubheading.
* doc/ref/fdl.texi (ADDENDUM: How to use this License for your
  documents): Turn into @appendixsec.
* doc/ref/gh.texi: Don't use @dots{} in the middle of @deftypefun{,x}.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

doc/ref/api-options.texi

@@ -377,9 +377,9 @@ configure @emph{reading}, @emph{printing}, @emph{debugging} or
 * User level options interfaces::
 * Reader options::
 * Printing options::
-* Debugger options::
 * Evaluator options::
 * Evaluator trap options::
+* Debugger options::
 * Examples of option use::
 @end menu
 

doc/ref/api-utility.texi

@@ -657,7 +657,7 @@ Return 1 if @var{x} is a Scheme-level hook, 0 otherwise.
 @end deftypefn
 
 
-@subsubsection Handling Scheme-level hooks from C code
+@subsubheading Handling Scheme-level hooks from C code
 
 Here is an example of how to handle Scheme-level hooks from C code using
 the above functions.

doc/ref/fdl.texi

@@ -408,7 +408,7 @@ as a draft) by the Free Software Foundation.
 @end enumerate
 
 @page
-@appendixsubsec ADDENDUM: How to use this License for your documents
+@appendixsec ADDENDUM: How to use this License for your documents
 
 To use this License in a document you have written, include a copy of
 the License in the document and put the following copyright and

doc/ref/gh.texi

@@ -995,8 +995,8 @@ These correspond to the Scheme @code{(cons a b)} and @code{(list l0 l1
 
 @deftypefun SCM gh_car (SCM @var{obj})
 @deftypefunx SCM gh_cdr (SCM @var{obj})
-@dots{}
-
+@deftypefunx SCM gh_c[ad][ad]r (SCM @var{obj})
+@deftypefunx SCM gh_c[ad][ad][ad]r (SCM @var{obj})
 @deftypefunx SCM gh_c[ad][ad][ad][ad]r (SCM @var{obj})
 These correspond to the Scheme @code{(caadar ls)} procedures etc @dots{}
 @end deftypefun