DOCSP-13258: [Charts] Queries with /regex/ syntax are accepted but don't work (#437)

Author: steveren

source/filter-chart-results.txt

@@ -477,10 +477,6 @@ To filter data using the :guilabel:`Query` bar:
 
          { <field>: { $regex: "pattern", $options: "<options>" } }
 
-      .. note::
-
-         You must enclose the pattern in quotes.  You cannot use the ``/pattern/`` syntax.
-
       For example, to find all documents where the ``jobs`` field begins with
       the letter ``A``, you would write the following in the
       :guilabel:`Query` bar: