Manual: indicate dune is preferred over ocamlbuild.

doc/manual.tex

@@ -4137,7 +4137,7 @@ This material should be of interest only to authors of build systems
 who wish to build support for \menhir into their system.
 %
 Ordinary users should skip this section and use a build system that knows
-about \menhir, such as \ocamlbuild or \dune.
+about \menhir, such as \dune (preferred) or \ocamlbuild.
 
 \subsection{\ocaml type inference and dependency analysis}
 \label{sec:build:infer}
@@ -4301,8 +4301,6 @@ parser generated by \menhir. What are these flags? In the absence of the
 \menhirlib is visible to the \ocaml compiler. If the support library
 \menhirlib was installed via \ocamlfind, a \texttt{-package} directive is
 issued; otherwise, a \texttt{-I} directive is used.
-% The file \distrib{demos/obsolete/Makefile.shared} shows how to exploit
-% the \texttt{--suggest-*} switches.
 
 \docswitch{\osuggestlinkb} This switch causes \menhir to print a set of
 suggested link flags, and exit. These flags are intended to be passed to
@@ -4311,8 +4309,6 @@ the absence of the \otable switch, they are empty. When \otable is set, these
 flags ensure that \menhirlib is linked in. If the support library \menhirlib
 was installed via \ocamlfind, a \texttt{-linkpkg} directive is issued;
 otherwise, the object file \texttt{menhirLib.cmo} is named.
-% The file \distrib{demos/obsolete/Makefile.shared} shows how to exploit
-% the \texttt{--suggest-*} switches.
 
 \docswitch{\osuggestlinko} This switch causes \menhir to print a set of
 suggested link flags, and exit. These flags are intended to be passed to
@@ -4321,8 +4317,6 @@ flags? In the absence of the \otable switch, they are empty. When \otable is
 set, these flags ensure that \menhirlib is linked in. If the support library
 \menhirlib was installed via \ocamlfind, a \texttt{-linkpkg} directive is
 issued; otherwise, the object file \texttt{menhirLib.cmx} is named.
-% The file \distrib{demos/obsolete/Makefile.shared} shows how to exploit
-% the \texttt{--suggest-*} switches.
 
 \docswitch{\osuggestmenhirlib} This switch causes \menhir to print (the
 absolute path of) the directory where \menhirlib was installed. If \menhirlib
@@ -4472,9 +4466,9 @@ time spent in the lexer and in the semantic actions.
 \question{How do I write \Makefile rules for \menhir?}
 This can a bit tricky. % understatement
 If you must do this, see \sref{sec:build}.
-% and look at \distrib{demos/obsolete/Makefile.shared}.
 It is recommended instead to use a build system
-with built-in support for \menhir, such as \ocamlbuild or \dune.
+with built-in support for \menhir, such as \dune (preferred)
+or \ocamlbuild.
 
 \question{How do I use \menhir with \ocamlbuild?}
 Pass \verb+-use-ocamlfind -use-menhir+ to \ocamlbuild.