RSpec/Focus does not see the focus attribute on shared_examples

[tmaier]

I had the following code and RSpec/Focus overlooked the focus attribute.

RSpec.shared_examples 'Foable', focus: true do
  it { is_expected.to do things }
end

Gem Versions:

• rubocop-rspec (2.22.0)
• rubocop (1.54.2)
• rubocop-ast (1.29.0)

[pirj]

Would you like to submit a PR?
It's a matter of adding SharedGroups.all here, extending the doc and adding an example.

[tmaier]

Done @pirj , see #1674