Updated hdoc_to_opale schema to take local explanations within MCQ into consideration

schemas/xhtml/hdoc1-xhtml.rng

@@ -193,12 +193,14 @@
                         <text/>
                     </element>
                 </optional>
+                <ref name="Flow"/>
                 <optional>
                     <element name="div">
                         <ref name="DivType"/>
+                        <ref name="Text"/>
                     </element>
                 </optional>
-                <ref name="Flow"/>
+                
             </element>
         </oneOrMore>
     </define>