various fixes:

+ fix typos
+ fix const correctness
+ whitespace improvements

src/Mod/Sketcher/Gui/ViewProviderSketch.cpp

@@ -5823,5 +5823,4 @@ void ViewProviderSketch::showRestoreInformationLayer() {
 
     visibleInformationChanged = true ;
     draw(false,false);
-    
-}
+}