Fix wrong words (dotnet#8517)

Author: hdefucom

xml/System.Windows.Forms/Control.xml

@@ -1699,8 +1699,8 @@
         <ReturnType>System.Int32</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets the distance, in pixels, between the top edge of the control and the top edge of its container's client area.</summary>
-        <value>An <see cref="T:System.Int32" /> representing the distance, in pixels, between the top edge of the control and the top edge of its container's client area.</value>
+        <summary>Gets the distance, in pixels, between the bottom edge of the control and the top edge of its container's client area.</summary>
+        <value>An <see cref="T:System.Int32" /> representing the distance, in pixels, between the bottom edge of the control and the top edge of its container's client area.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[