Copilot commented on code in PR #13018:
URL: https://github.com/apache/trafficserver/pull/13018#discussion_r2977859758
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doc/admin-guide/logging/formatting.en.rst:
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@@ -314,8 +314,27 @@ prior to the log field's name, as so::
Format = '%<{User-agent}cqh>'
The above would insert the User Agent string from the client request headers
-into your log entry (or a blank string if no such header was present, or it did
-not contain a value).
+into your log entry (or ``-`` if no such header was present).
+
+Header fields can also be chained with a fallback operator, `?:`, when you want
Review Comment:
The inline markup for the fallback operator uses single backticks (`?:`),
which in reStructuredText is interpreted text and can render unexpectedly /
trigger Sphinx warnings. Use a literal (double-backtick) inline code block
(``?:``) for consistency with the surrounding literals (e.g., ``-``).
```suggestion
Header fields can also be chained with a fallback operator, ``?:``, when you
want
```
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