Fixed a few more Doxygen syntax warnings.

docs/doxygen/mainpages/const_cpp.h

@@ -141,7 +141,7 @@ compiler used.
                     @c 1020 for @c 4.2 (the first supported version), @c 1100 for
                     @c 5.0, @c 1200 for @c 6.0 and so on. For convenience, the symbols
                     __VISUALCn__ are also defined for each major compiler version from
-                    5 to 12, i.e. you can use tests such as <tt>#ifdef \_\_VISUALC7\_\_</tt>
+                    5 to 12, i.e. you can use tests such as <tt>\#ifdef \_\_VISUALC7\_\_</tt>
                     to test for compiler version being precisely 7.}
 @itemdef{__XLC__, AIX compiler}
 @itemdef{__WATCOMC__, Watcom C++. The value of this macro corresponds to
@@ -260,7 +260,7 @@ configuration.
         includes a number of wxWidgets headers thus making it unnecessary to include
         them explicitly. However if this is not defined, you do need to include them
         and so the usual idiom which allows to support both cases is to first include
-        @c wx/wxprec.h} and then, inside <tt>#ifndef WX_PRECOMP</tt>, individual
+        @c wx/wxprec.h} and then, inside <tt>\#ifndef WX_PRECOMP</tt>, individual
         headers you need.}
 @itemdef{_UNICODE and UNICODE, both are defined if wxUSE_UNICODE is set to @c 1}
 @itemdef{wxUSE_GUI,

interface/wx/wizard.h

@@ -546,7 +546,7 @@ public:
         - @b wxWIZARD_HALIGN_LEFT: Left-aligns the bitmap.
         - @b wxWIZARD_HALIGN_CENTRE: Centres the bitmap horizontally.
         - @b wxWIZARD_HALIGN_RIGHT: Right-aligns the bitmap.
-        - @b wxWIZARD_TILE: @todo describe this
+        - @b wxWIZARD_TILE: The bitmap will be tiled to fit available space.
 
         See also SetMinimumBitmapWidth().
     */
@@ -585,4 +585,3 @@ public:
     */
     virtual void SetPageSize(const wxSize& sizePage);
 };
-