Document hintfilter limitations

The filter does not support prepared statements.
2020-01-16 12:05:53 +02:00
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 This filter adds routing hints to a service. The filter has no parameters.

+## Limitations
+
+The hintfilter does not support routing hints in prepared statements
+([MXS-2838](https://jira.mariadb.org/browse/MXS-2838)).
+
 # Hint Syntax

 **Note:** If a query has more than one comment only the first comment is