Fix scoped labels test cases descriptions

Based on their expectations

ee/spec/models/scoped_label_set_spec.rb

@@ -71,7 +71,7 @@ describe ScopedLabelSet do
       expect(set.contains_any?([kv_label2.id])).to eq(true)
     end
 
-    it 'returns true if any of label ids is in set' do
+    it 'returns false if certain label ids is not in set' do
       set = described_class.new('key', [kv_label1])
 
       expect(set.contains_any?([kv_label2.id])).to eq(false)

ee/spec/support/shared_examples/scoped_label_examples.rb

@@ -40,7 +40,7 @@ shared_examples_for 'new issuable with scoped labels' do
         stub_licensed_features(scoped_labels: false)
       end
 
-      it 'adds only last selected exclusive scoped label' do
+      it 'adds all scoped labels' do
         label1 = create_label('label1')
         label2 = create_label('key::label1')
         label3 = create_label('key::label2')