Remove obsolete Group tag

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

rubygem-diff-lcs.spec

@@ -8,7 +8,6 @@ Name: rubygem-%{gem_name}
 Version: 1.3
 Release: 5%{?dist}
 Summary: Provide a list of changes between two sequenced collections
-Group: Development/Languages
 License: GPLv2+ or Artistic or MIT
 URL: https://github.com/halostatue/diff-lcs
 Source0: https://rubygems.org/gems/%{gem_name}-%{version}.gem
@@ -27,7 +26,6 @@ to create a simple HTML diff output format and a standard diff-like tool.
 
 %package doc
 Summary: Documentation for %{name}
-Group: Documentation
 Requires: %{name} = %{version}-%{release}
 BuildArch: noarch