doc: do not highlight bad transactional rule

As stated, it will refuse to load.

Ticket: 8372

doc/userguide/rules/intro.rst

@@ -336,7 +336,6 @@ Transactional rules can use direction-ambiguous keywords, by specifying the dire
 
 Transactional rules have some limitations :
 
-* They cannot use direction-ambiguous keywords
 * They are only meant to work on transactions with first a request to the server,
   and then a response to the client, and not the other way around (not tested).
 * They cannot have ``fast_pattern`` or ``prefilter`` the direction to client
@@ -345,9 +344,7 @@ Transactional rules have some limitations :
 
 This rule cannot have the ``fast_pattern`` to client, as ``file.data`` is a streaming buffer and will refuse to load.
 
-.. container:: example-rule
-
-    alert http any any => any any (file.data: to_server; content: "123";  http.stat_code; content: "500"; fast_pattern; sid: 1;)
+``alert http any any => any any (file.data: to_server; content: "123";  http.stat_code; content: "500"; fast_pattern; sid: 1;)``
 
 If not explicit, a transactional rule will choose a fast_pattern to server by default.