Remove #strip_indent from shared example 'offense'
Remove #strip_indent from shared example 'offense'

After dropping Ruby 2.2 support, we can often use `<<~` instead of
calling `#strip_indent`.

rrosenblum/rubocop,maxjacobson/rubocop,meganemura/rubocop,tdeo/rubocop,rrosenblum/rubocop,rrosenblum/rubocop,meganemura/rubocop,tdeo/rubocop,meganemura/rubocop,jmks/rubocop,tdeo/rubocop,maxjacobson/rubocop,tejasbubane/rubocop,maxjacobson/rubocop,bbatsov/rubocop,jmks/rubocop,jmks/rubocop,deivid-rodriguez/rubocop,tejasbubane/rubocop,smakagon/rubocop,smakagon/rubocop,bbatsov/rubocop,deivid-rodriguez/rubocop,deivid-rodriguez/rubocop,tejasbubane/rubocop