Document hintfilter limitations

The filter does not support prepared statements.
mariadb-corporation · Jan 16, 2020 · e3e92e7 · e3e92e7
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diff --git a/Documentation/Filters/Hintfilter.md b/Documentation/Filters/Hintfilter.md
@@ -2,6 +2,11 @@
 
 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