improve comment

esphome/components/http_request/http_request_arduino.cpp

@@ -171,8 +171,8 @@ int HttpContainerArduino::read(uint8_t *buf, size_t max_len) {
   }
 
   int available_data = stream_ptr->available();
-  // For chunked transfer encoding, content_length is effectively unknown, so don't limit by it.
-  // HTTPClient::getSize() returns -1 for chunked, which becomes SIZE_MAX when cast to size_t.
+  // For chunked transfer encoding, HTTPClient::getSize() returns -1, which becomes SIZE_MAX when
+  // cast to size_t. SIZE_MAX - bytes_read_ is still huge, so it won't limit the read.
   size_t remaining = (this->content_length > 0) ? (this->content_length - this->bytes_read_) : max_len;
   int bufsize = std::min(max_len, std::min(remaining, (size_t) available_data));