Update ns-Accessibility.xml (#3289)

Author: RobinRH

xml/ns-Accessibility.xml

@@ -1,6 +1,6 @@
 <Namespace Name="Accessibility">
   <Docs>
-    <summary>The <see cref="N:Accessibility" /> and all of its exposed members are part of a managed wrapper for the Component Object Model (COM) accessibility interface.</summary>
+    <summary>The <see cref="N:Accessibility" /> namespace and all of its exposed members are part of a managed wrapper for the Component Object Model (COM) accessibility interface.</summary>
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
@@ -10,4 +10,4 @@
  ]]></format>
     </remarks>
   </Docs>
-</Namespace>
+</Namespace>