Clarify comments on GetResolvedSourceFeatures

PiperOrigin-RevId: 574472013

src/google/protobuf/compiler/code_generator.h

@@ -135,9 +135,9 @@ class PROTOC_EXPORT CodeGenerator {
 
  protected:
   // Retrieves the resolved source features for a given descriptor.  All the
-  // features that are imported (from the proto file) and linked in (from the
-  // callers binary) will be fully resolved. These should be used to make any
-  // feature-based decisions during code generation.
+  // global features and language features returned by GetFeatureExtensions will
+  // be fully resolved. These should be used to make any feature-based decisions
+  // during code generation.
   template <typename DescriptorT>
   static const FeatureSet& GetResolvedSourceFeatures(const DescriptorT& desc) {
     return ::google::protobuf::internal::InternalFeatureHelper::GetFeatures(desc);