update hpb_generator emitted comment protos_generator -> hpb_generator

PiperOrigin-RevId: 646110222

hpb_generator/output.cc

diff --git a/hpb_generator/output.cc b/hpb_generator/output.cc
index 7e0851e..e29fed2 100644
--- a/hpb_generator/output.cc
+++ b/hpb_generator/output.cc
@@ -37,7 +37,7 @@
 void EmitFileWarning(const protobuf::FileDescriptor* file, Output& output) {
   output(
       R"cc(
-        /* This file was generated by protos_generator (the upb C++ compiler) "
+        /* This file was generated by hpb_generator (Handle Protobuf) "
         from the input
          * file:
          *