fix(reply): honour explicit [[reply_to_*]] tags when replyToMode is off (#16174)

Merged via /review-pr -> /prepare-pr -> /merge-pr.

Prepared head SHA: 778fc2559a
Co-authored-by: aldoeliacim <17973757+aldoeliacim@users.noreply.github.com>
Co-authored-by: steipete <58493+steipete@users.noreply.github.com>
Reviewed-by: @steipete

docs/channels/telegram.md

@@ -416,6 +416,8 @@ curl "https://api.telegram.org/bot<bot_token>/getUpdates"
     - `first`
     - `all`
 
+    Note: `off` disables implicit reply threading. Explicit `[[reply_to_*]]` tags are still honored.
+
   </Accordion>
 
   <Accordion title="Forum topics and thread behavior">