Manual: fix some pointers to the demos.

doc/manual.tex

@@ -1011,8 +1011,8 @@ The identity semantic action \dpfidentityaction is here synonymous with
 \dpaction{\nt{x}}.
 
 Other illustrations of the new syntax can be found in
-the directories \distrib{demos/calc-new-syntax-dune}
-and \distrib{demos/calc-ast-dune}.
+the directories \distrib{demos/calc-new-syntax}
+and \distrib{demos/calc-ast}.
 
 \section{Advanced features}
 
@@ -4479,13 +4479,13 @@ into a single parser,
 say \verb+parser.{ml,mli}+,
 create a file named \verb+parser.mlypack+
 that contains the module names \verb+A B+.
-See the \distrib{demos} directory for examples.
+See the directory \distrib{demos/ocamlbuild} for examples.
 To deal with \messages files (\sref{sec:errors:new}),
 use the rules provided in the file \distrib{demos/ocamlbuild/myocamlbuild.ml}.
 
 % Advanced scenario: to use --only-tokens and -external-tokens,
 % use .mlypack + _tags + myocamlbuild.ml. Not explained here,
-% but \distrib{demos/calc-two} contains an example.
+% but \distrib{demos/ocamlbuild/calc-two} contains an example.
 
 \question{How do I use \menhir with \dune?} Please use \dune version 1.4.0
 or newer, as it has appropriate built-in rules for Menhir parsers. In the
@@ -4504,7 +4504,7 @@ instead, write \texttt{(infer true)} or \texttt{(infer false)}, as done above.
 (The default is \texttt{true}.) Ordinary command line switches, like \oexplain
 and \odump, are passed as part of the \texttt{flags} line, as done above.
 %
-The directory \distrib{demos/calc-dune}
+The directory \distrib{demos/calc}
 % (and others like it)
 offers an example.
 %