Fix various trailing newlines, typos and grammar

src/Mod/TechDraw/Gui/TaskLeaderLine.cpp

@@ -443,7 +443,7 @@ void TaskLeaderLine::removeFeature()
         if (Gui::Command::hasPendingCommand()) {
             std::vector<std::string> undos = Gui::Application::Instance->activeDocument()->getUndoVector();
             Gui::Application::Instance->activeDocument()->undo(1);
-        } 
+        }
     }
 }
 

src/Mod/TechDraw/TDTest/DrawViewDetailTest.py

@@ -69,7 +69,7 @@ class DrawViewDetailTest(unittest.TestCase):
         loop.exec_()
 
         edges = detail.getVisibleEdges()
-        
+
         self.assertEqual(len(edges), 4, "DrawViewDetail has wrong number of edges")
         self.assertTrue("Up-to-date" in detail.State, "DrawViewDetail is not Up-to-date")