doc: fix typo in cli.md for report-dir

Add the missing backtick in `--report-dir`

refs: #33587 (comment)

PR-URL: #33725
Refs: #33587
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Beth Griggs <Bethany.Griggs@uk.ibm.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Zeyu Yang <himself65@outlook.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>

doc/api/cli.md

@@ -635,7 +635,7 @@ Write reports in a compact format, single-line JSON, more easily consumable
 by log processing systems than the default multi-line format designed for
 human consumption.
 
-### --report-dir=directory`, `report-directory=directory`
+### `--report-dir=directory`, `report-directory=directory`
 <!-- YAML
 added: v11.8.0
 changes: