Apply suggestions from code review

Co-authored-by: Genevieve Warren <[email protected]>

Author: lonitra

xml/System.Windows.Forms/ToolStripItem.xml

@@ -5857,7 +5857,7 @@ If you set the <xref:System.Windows.Forms.ToolStripItem.ImageKey%2A> property, t
         <param name="e">To be added.</param>
         <summary>Raises the <see cref="E:System.Windows.Forms.ToolStripItem.SelectedChanged" /> event.</summary>
         <remarks>
-          <para>This method will be called when selected <see cref="T:System.Windows.Forms.ToolStripItem" /> changes.</para>
+          <para>This method will be called when the selected <see cref="T:System.Windows.Forms.ToolStripItem" /> changes.</para>
           <para>Call <c>base.OnSelectedChanged</c> to send this event to any registered event listeners.</para>
         </remarks>
       </Docs>
@@ -7297,11 +7297,11 @@ If you set the <xref:System.Windows.Forms.ToolStripItem.ImageKey%2A> property, t
         <ReturnType>System.EventHandler</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Occurs when value of the <see cref="P:System.Windows.Forms.ToolStripItem.Selected" /> property changes.</summary>
+        <summary>Occurs when the value of the <see cref="P:System.Windows.Forms.ToolStripItem.Selected" /> property changes.</summary>
         <remarks>
-          <para>This event is raised when item is selected by mouse, keyboard or programmatically.</para>
-          <para>.NET Core 3.1 had removed MainMenu and MenuItem controls. ToolStripMenuItem.SelectedChanged event</para>
-          <para>is recommended as a replacement for MenuItem.Select event.</para>
+          <para>This event is raised when an item is selected by mouse or keyboard, or programmatically.</para>
+          <para>.NET Core 3.1 removed the MainMenu and MenuItem controls. The ToolStripMenuItem.SelectedChanged event</para>
+          <para>is recommended as a replacement for the MenuItem.Select event.</para>
         </remarks>
       </Docs>
     </Member>