update test to match new disabled option description

spec/helpers/visibility_level_helper_spec.rb

@@ -120,7 +120,7 @@ describe VisibilityLevelHelper do
     describe "project" do
       it "provides correct description for disabled levels" do
         expect(disallowed_visibility_level?(project, Gitlab::VisibilityLevel::PUBLIC)).to be_truthy
-        expect(disallowed_visibility_level_description(Gitlab::VisibilityLevel::PUBLIC, project))
+        expect(strip_tags disallowed_visibility_level_description(Gitlab::VisibilityLevel::PUBLIC, project))
           .to include "the visibility of #{project.group.name} is internal"
       end
     end