Misc. typos

+ stepcode typo submitted upsream https://github.com/stepcode/stepcode/pull/372

src/Mod/Part/App/Attacher.cpp

@@ -1302,7 +1302,7 @@ Base::Placement AttachEngine3D::calculateAttachedPlacement(Base::Placement origP
             case mmFrenetTB:
                 if (N.Magnitude() == 0.0)
                     throw Base::ValueError("AttachEngine3D::calculateAttachedPlacement: Frenet-Serret normal is undefined. Can't align to TB plane.");
-                SketchNormal = N.Reversed();//it is more convenient to sketch on something looking it it so it is convex.
+                SketchNormal = N.Reversed();//it is more convenient to sketch on something looking at it so it is convex.
                 SketchXAxis = T;
                 break;
             default:

src/Mod/Part/App/TopologyPy.h

@@ -52,7 +52,7 @@ protected:
 
 public:
 
-	/// Constructer 
+	/// Constructor 
   TopoShapePyOld(PyTypeObject *T = &Type);
   TopoShapePyOld(const TopoDS_Shape &cShape, PyTypeObject *T = &TopoShapePyOld::Type);
 	/// for Construction in python 

src/Mod/Part/Gui/TaskDimension.h

@@ -63,7 +63,7 @@ namespace PartGui
    */
   bool getShapeFromStrings(TopoDS_Shape &shapeOut, const std::string &doc, const std::string &object, const std::string &sub);
   /*!examine pre selection
-   * @param shape1 firt shape in current selection
+   * @param shape1 first shape in current selection
    * @param shape2 second shape in current selection
    * @return signal if preselection is valid. false means shape1 and shape2 are invalid.
    */
@@ -349,7 +349,7 @@ private:
 /*!start of the measure angular command*/
 void goDimensionAngularRoot();
 /*!examine angular pre selection
-  * @param vector1Out firt shape in current selection
+  * @param vector1Out first shape in current selection
   * @param vector2Out second shape in current selection
   * @return signal if preselection is valid. false means vector1Out and vector2Out are invalid.
   */