Fix various typos and whitespace

src/Mod/PartDesign/App/Feature.cpp

@@ -256,7 +256,7 @@ App::DocumentObject *Feature::getSubObject(const char *subname,
                         // supposed to be contained inside a body. It makes
                         // little sense to transform its sub-object. So if 'no
                         // transform' is requested, we need to actively apply
-                        // an inverse trasnform.
+                        // an inverse transform.
                         _mat = Placement.getValue().inverse().toMatrix();
                         if (pmat)
                             *pmat *= _mat; 

src/Mod/PartDesign/Gui/Command.cpp

@@ -729,7 +729,7 @@ void prepareProfileBased(PartDesign::Body *pcActiveBody, Gui::Command* cmd, cons
 
             // `ProfileBased::getProfileShape()` and other methods will return
             // just the sub-shapes if they are set. So when whole sketches are
-            // desired, don not set sub-values.
+            // desired, don't set sub-values.
             if (feature->isDerivedFrom(Part::Part2DObject::getClassTypeId()) &&
                 subName.compare(0, 6, "Vertex") != 0)
                 runProfileCmd();

src/Mod/PartDesign/Gui/TaskExtrudeParameters.cpp

@@ -626,7 +626,7 @@ void TaskExtrudeParameters::setDirectionMode(int index)
         extrude->UseCustomVector.setValue(false);
     }
 
-    // if we dont use custom direction, only allow to show its direction
+    // if we don't use custom direction, only allow to show its direction
     if (index != DirectionModes::Custom) {
         ui->XDirectionEdit->setEnabled(false);
         ui->YDirectionEdit->setEnabled(false);