Update spec/grape/api_spec.rb

Co-authored-by: Manuel Jacob <[email protected]>

spec/grape/api_spec.rb

@@ -2193,7 +2193,7 @@ def foo
       expect(last_response.body).to eq('Formatter Error')
     end
 
-    context 'when block returns an invalid response' do
+    context 'when rescue_from block returns an invalid response' do
       it 'returns a formatted response' do
         subject.rescue_from(:all) { 'error' }
         subject.get('/') { raise }