Fix RSpec/MissingExampleGroupArgument cop (#25310)

spec/models/trends/statuses_spec.rb

@@ -81,7 +81,7 @@ RSpec.describe Trends::Statuses do
       4.times { reblog(status3, today) }
     end
 
-    context do
+    context 'when status trends are refreshed' do
       before do
         subject.refresh(today)
       end

spec/models/trends/tags_spec.rb

@@ -44,7 +44,7 @@ RSpec.describe Trends::Tags do
       4.times  { |i| subject.add(tag2, i, today) }
     end
 
-    context do
+    context 'when tag trends are refreshed' do
       before do
         subject.refresh(yesterday + 12.hours)
         subject.refresh(at_time)