Fixed a security problem caused by changed simplejson semantics.

Notice: this was never in a release version of Flask.

docs/patterns/jquery.rst

@@ -77,7 +77,8 @@ inside a `script` block here where different rules apply.
    will not be parsed.  Everything until ``</script>`` is handled as script.
    This also means that there must never be any ``</`` between the script
    tags.  ``|tojson`` is kindly enough to do the right thing here and
-   escape backslashes for you.
+   escape slashes for you (``{{ "</script>"|tojson|safe }`` is rendered as
+   ``"<\/script>"``).
 
 
 JSON View Functions