Merge branch 'fix-rubocop-violations' into 'master'

Fix rubocop violations

See merge request gitlab-org/gitlab-ce!24837

spec/features/markdown/math_spec.rb

 require 'spec_helper'
 
 describe 'Math rendering', :js do
-  let!(:project)   { create(:project, :public) }
+  let!(:project) { create(:project, :public) }
 
   it 'renders inline and display math correctly' do
     description = <<~MATH

spec/lib/safe_zip/extract_spec.rb

@@ -36,7 +36,7 @@ describe SafeZip::Extract do
       end
     end
 
-    %w(valid-simple.zip valid-symlinks-first.zip valid-non-writeable.zip).each  do |name|
+    %w(valid-simple.zip valid-symlinks-first.zip valid-non-writeable.zip).each do |name|
       context "when using #{name} archive" do
         let(:archive_name) { name }
 

spec/services/members/destroy_service_spec.rb

@@ -168,7 +168,7 @@ describe Members::DestroyService do
       end
 
       it_behaves_like 'a service destroying a member' do
-        let(:opts) { { skip_authorization: true, skip_subresources: true  } }
+        let(:opts) { { skip_authorization: true, skip_subresources: true } }
         let(:member) { group.requesters.find_by(user_id: member_user.id) }
       end
     end