Fix verbatim blocks of Doxygen comments.

* src/ltlast/formula.hh, src/ltlvisit/contain.hh,
src/ltlvisit/randomltl.hh, src/ltlvisit/reduce.hh,
src/ltlvisit/remove_x.hh, src/ltlvisit/simplify.hh, src/ltlvisit/snf.hh,
src/misc/minato.hh, src/misc/optionmap.hh,
src/saba/sabacomplementtgba.hh, src/taalgos/emptinessta.hh,
src/taalgos/minimize.hh, src/taalgos/tgba2ta.hh,
src/tgba/tgbakvcomplement.hh, src/tgbaalgos/cycles.hh,
src/tgbaalgos/eltl2tgba_lacim.hh, src/tgbaalgos/gtec/gtec.hh,
src/tgbaalgos/gv04.hh, src/tgbaalgos/ltl2taa.hh,
src/tgbaalgos/ltl2tgba_fm.hh, src/tgbaalgos/ltl2tgba_lacim.hh,
src/tgbaalgos/magic.hh, src/tgbaalgos/minimize.hh,
src/tgbaalgos/randomgraph.hh, src/tgbaalgos/se05.hh,
src/tgbaalgos/simulation.hh, src/tgbaalgos/tau03.hh,
src/tgbaalgos/tau03opt.hh: Surround verbatim blocks with /** ... */
instead of using /// on each line.  Otherwise Doxygen will output the
leading "///" tokens -- apparently this is a feature.
* src/sanity/style.test: Strip multi-line comments before checking
code style.

src/ltlvisit/snf.hh

@@ -37,16 +37,16 @@ namespace spot
     /// corresponds to the E° operation defined in the following
     /// paper.
     ///
-    /// \verbatim
-    /// @Article{	  bruggeman.96.tcs,
-    ///   author	= {Anne Br{\"u}ggemann-Klein},
-    ///   title		= {Regular Expressions into Finite Automata},
-    ///   journal	= {Theoretical Computer Science},
-    ///   year		= {1996},
-    ///   volume	= {120},
-    ///   pages		= {87--98}
-    /// }
-    /// \endverbatim
+    /** \verbatim
+        @Article{	  bruggeman.96.tcs,
+          author	= {Anne Br{\"u}ggemann-Klein},
+          title		= {Regular Expressions into Finite Automata},
+          journal	= {Theoretical Computer Science},
+          year		= {1996},
+          volume	= {120},
+          pages		= {87--98}
+        }
+        \endverbatim */
     ///
     /// \param sere the SERE to rewrite
     /// \param cache an optional cache