fix typo and add hint to GUI

ethereal/ethereal.spec

@@ -36,7 +36,7 @@
 
 #   package information
 Name:         ethereal
-Summary:      Realtime Network Protcol Analyzer
+Summary:      Graphical Realtime Network Protocol Analyzer
 URL:          http://www.ethereal.com/
 Vendor:       John Doe
 Packager:     The OpenPKG Project