Fix RSpec/ContextWording cop (#24739)

spec/controllers/api/v1/accounts_controller_spec.rb

@@ -30,7 +30,7 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
       post :create, params: { username: 'test', password: '12345678', email: 'hello@world.tld', agreement: agreement }
     end
 
-    context 'given truthy agreement' do
+    context 'when given truthy agreement' do
       let(:agreement) { 'true' }
 
       it 'returns http success' do
@@ -48,7 +48,7 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
       end
     end
 
-    context 'given no agreement' do
+    context 'when given no agreement' do
       it 'returns http unprocessable entity' do
         expect(response).to have_http_status(422)
       end
@@ -121,7 +121,7 @@ RSpec.describe Api::V1::AccountsController, type: :controller do
       end
     end
 
-    context 'modifying follow options' do
+    context 'when modifying follow options' do
       let(:locked) { false }
 
       before do