Misc. typos: Please merge right before 0.17 release

I'm still finding typos in the source code. I propose that you keep this PR open prior ro relaese and then merge  so that if I find other typos in the meantime they will be part this release.

src/Gui/ViewProviderOriginFeature.cpp

@@ -116,7 +116,7 @@ void ViewProviderOriginFeature::attach(App::DocumentObject* pcObject)
     highlight->documentName  = getObject()->getDocument()->getName();
     highlight->style = SoFCSelection::EMISSIVE_DIFFUSE;
 
-    // Style for normal (visiable) lines
+    // Style for normal (visible) lines
     SoDrawStyle* style = new SoDrawStyle ();
     style->lineWidth = 2.0f;
     highlight->addChild ( style );