Don't mention wxPenInfoBase in the documentation

This is an implementation detail, don't confuse the user with this
template class which isn't supposed to be used in the user code.

Also improve the example in the documentation, the old one (using pen of
width 0 but with a colour) didn't make much sense.

interface/wx/graphics.h

@@ -1541,22 +1541,23 @@ public:
     calls to its clearly named methods instead of passing them in the fixed
     order to wxGraphicsPen constructors.
 
-    Typically you would use wxGraphicsPenInfo with a wxGraphicsContext:
+    Typically you would use wxGraphicsPenInfo with a wxGraphicsContext, e.g. to
+    start drawing with a dotted blue pen slightly wider than normal you could
+    write the following:
     @code
     wxGraphicsContext ctx = wxGraphicsContext::Create(dc);
 
-    ctx.SetPen(wxGraphicsPenInfo(*wxBLUE, 1.25));
+    ctx.SetPen(wxGraphicsPenInfo(*wxBLUE).Width(1.25).Style(wxPENSTYLE_DOT));
     @endcode
 
     @since 3.1.1
  */
-class wxGraphicsPenInfo : public wxPenInfoBase<wxGraphicsPenInfo>
+class wxGraphicsPenInfo
 {
 public:
-
-    explicit wxGraphicsPenInfo(const wxColour& colour = wxColour(), wxDouble width = 1.0, wxPenStyle style = wxPENSTYLE_SOLID);
-
-    static wxGraphicsPenInfo CreateFromPen(const wxPen& pen);
+    explicit wxGraphicsPenInfo(const wxColour& colour = wxColour(),
+                               wxDouble width = 1.0,
+                               wxPenStyle style = wxPENSTYLE_SOLID);
 
     wxGraphicsPenInfo& Colour(const wxColour& col);