Remove hard TABs from documentation files

No real changes.

interface/wx/aui/framemanager.h

@@ -908,7 +908,7 @@ public:
         "Safe parts" are all non-UI elements (e.g. all layout determining parameters like the
         size, position etc.). "Unsafe parts" (pointers to button, frame and window) are not
         modified by this write operation.
-	 
+
         @remark This method is used when loading perspectives.
     */
     void SafeSet(wxAuiPaneInfo source);

interface/wx/listbox.h

@@ -61,9 +61,9 @@
         list is selected or the selection changes.
     @event{EVT_LISTBOX_DCLICK(id, func)}
         Process a @c wxEVT_LISTBOX_DCLICK event, when the listbox
-        is double-clicked. On some platforms (notably wxGTK2) 
-	pressing the enter key is handled as an equivalent of a 
-	double-click.
+        is double-clicked. On some platforms (notably wxGTK2)
+        pressing the enter key is handled as an equivalent of a
+        double-click.
     @endEventTable
 
     @library{wxcore}

interface/wx/log.h

@@ -801,7 +801,7 @@ public:
         The messages will be written in the encoding specified by the
         given @c wxMBConv.
 
-		The @a conv argument is only available in wxWidgets 3.1.1 and later.
+        The @a conv argument is only available in wxWidgets 3.1.1 and later.
 
         @note
             In practice, it is only advisable to specify @c wxConvUTF8 as