Remove obsolete Group tag

References: https://fedoraproject.org/wiki/Changes/Remove_Group_Tag

rubygem-method_source.spec

@@ -5,7 +5,6 @@ Summary: Retrieve the source code for a method
 Name: rubygem-%{gem_name}
 Version: 0.8.2
 Release: 8%{?dist}
-Group: Development/Languages
 License: MIT
 URL: http://banisterfiend.wordpress.com
 Source0: http://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -27,7 +26,6 @@ Retrieve the source code for a method
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch