docs - remove MADlib 1.11 note (#6360)

gpdb-doc/dita/ref_guide/extensions/madlib.xml

@@ -28,18 +28,6 @@
       <p>MADlib can be used with PivotalR, an R package that enables users to interact with data
         resident in Greenplum Database using the R client. See <xref href="#topic_dxp_vq2_sv"
           format="dita"/>.</p>
-      <note>When using MADlib 1.11 and earlier, set the server configuration parameter
-          <codeph>optimizer_control</codeph> to <codeph>on</codeph> (the default). If the parameter
-        is set to <codeph>off</codeph>, these MADlib functions do not work: decision tree, random
-        forest, LDA, k-Means, PMML export for decision tree, PMML export for random forest. <ph
-          otherprops="pivotal">The installation checks for these functions also fail.</ph><p>The
-          parameter <codeph>optimizer_control</codeph> controls whether the server configuration
-          parameter <codeph>optimizer</codeph> can be changed. The parameter
-            <codeph>optimizer</codeph> controls whether the GPORCA optimizer is enabled when running
-          SQL queries. Some MADlib installation checks and functions change the value of
-            <codeph>optimizer</codeph> to improve performance. If <codeph>optimizer_control</codeph>
-          is set to <codeph>off</codeph>, the value of <codeph>optimizer</codeph> cannot be changed
-          and the function fails. </p></note>
     </body>
   </topic>
   <topic id="topic3" xml:lang="en" otherprops="pivotal">