message: Fix typo in GetProtoTextFunctionCode comments.
diff: @@ -38,7 +38,7 @@ struct ProtoTextFunctionCode {
  // 1. For each message:
  // * ProtoDebugString(m): same as msg.DebugString(), except that google.any
  // is not expanded.
  -// * ProtoShortDebugString(m): same as msg.ShorDebugString(), except that
  +// * ProtoShortDebugString(m): same as msg.ShortDebugString(), except that
  // google.any is not expanded.
  // * ProtoParseFromString(s, m): same as TextFormat.ParseFromString(s, &m);
  // 2. For each enum:
  