Only show message about edits effecting all copies if the document is not already open.

PROMS/Volian.Controls.Library/DisplayLibDocs.cs

@@ -244,7 +244,6 @@ namespace Volian.Controls.Library
                     MessageBox.Show("No Content in this document");
                     return;
                 }
-                MessageBox.Show("WARNING: All edits made to this Library Document will be applied to all uses of the Document");
                 _DisplayTabControl.OpenItem(di.LibraryDocumentUsageList[listBoxUsages.SelectedIndex]);
             }
         }