DOC: mention that %ms is left-padded with zeroes.
That's important to emit logs.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index f30ab42..d8b5a4a 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -14104,7 +14104,7 @@
| | %hrl | captured_request_headers CLF style | string list |
| | %hs | captured_response_headers default style | string |
| | %hsl | captured_response_headers CLF style | string list |
- | | %ms | accept date milliseconds | numeric |
+ | | %ms | accept date milliseconds (left-padded with 0) | numeric |
| | %pid | PID | numeric |
| H | %r | http_request | string |
| | %rc | retries | numeric |