Fix misspellings in comments and documentation

No real changes.

Closes https://github.com/wxWidgets/wxWidgets/pull/870

include/wx/osx/core/cfref.h

@@ -172,7 +172,7 @@ public:
      to transfer ownership of that reference to this ref holder.  If the object comes from
      a Create or Copy method then this is the correct behaviour.  If the object comes from
      a Get method then you must CFRetain it yourself before passing it to this constructor.
-     A handy way to do this is to use the non-member wxCFRefFromGet factory funcion.
+     A handy way to do this is to use the non-member wxCFRefFromGet factory function.
      */
     wxCFRef(refType p) : m_ptr(p)
     {
@@ -186,7 +186,7 @@ public:
                     to transfer ownership of that reference to this ref holder.  If the object comes from
                     a Create or Copy method then this is the correct behaviour.  If the object comes from
                     a Get method then you must CFRetain it yourself before passing it to this constructor.
-                    A handy way to do this is to use the non-member wxCFRefFromGet factory funcion.
+                    A handy way to do this is to use the non-member wxCFRefFromGet factory function.
                     This method is templated and takes an otherType *p.  This prevents implicit conversion
                     using an operator refType() in a different ref-holding class type.
     */