Updated documentation to acknowledge the fact that properties can have identical labels, and that they must have non-empty name that is unique under parent

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@55604 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/propgrid/propgridiface.h

@@ -1004,9 +1004,6 @@ public:
     }
 
     /** Sets label of a property.
-        @remarks
-        This is the only way to set property's name. There is not
-        wxPGProperty::SetLabel() method.
     */
     void SetPropertyLabel( wxPGPropArg id, const wxString& newproplabel );