THRIFT-1943 docstrings for enum values are ignored

Patch: Jens Geyer
diff --git a/compiler/cpp/src/generate/t_html_generator.cc b/compiler/cpp/src/generate/t_html_generator.cc
index fb319ac..0d0115d 100644
--- a/compiler/cpp/src/generate/t_html_generator.cc
+++ b/compiler/cpp/src/generate/t_html_generator.cc
@@ -733,7 +733,9 @@
     f_out_ << (*val_iter)->get_name();
     f_out_ << "</code></td><td><code>";
     f_out_ << (*val_iter)->get_value();
-    f_out_ << "</code></td></tr>" << endl;
+    f_out_ << "</code></td><td>" << endl;
+    print_doc((*val_iter));
+    f_out_ << "</td></tr>" << endl;
   }
   f_out_ << "</table></div>" << endl;
 }