Better explanation regarding existence of title elements being related to qandasets

ws/Docbook/Extensions/docbook.sch

@@ -248,7 +248,7 @@
   <!-- Goik's additions -->
    <s:pattern name="Mandatory title in exercise">
       <s:rule context="db:qandaset">
-         <s:assert test="db:title or name(preceding-sibling::*[1])='db:title'">title required for qandaset.</s:assert>
+         <s:assert test="db:title or name(preceding-sibling::*[1])='db:title'">Must be IMMEDIATELY following title or contain a title itself.</s:assert>
       </s:rule>
    </s:pattern>