Correct typo and indentation (#12617)

Author: mikkelbu

docs/framework/winforms/controls/how-to-append-a-menustrip-to-an-mdi-parent-window-windows-forms.md

@@ -37,17 +37,17 @@ In some applications, the kind of a multiple-document interface (MDI) child wind
 
 9. Set the <xref:System.Windows.Forms.MergeAction> property of the `&Special`, `Command&1`, and `Command&2` menu items to <xref:System.Windows.Forms.MergeAction.Append>.  
 
-10. Create an event handler for the <xref:System.Windows.Forms.Control.Click> event of the `&New`<xref:System.Windows.Forms.ToolStripMenuItem>.  
+10. Create an event handler for the <xref:System.Windows.Forms.Control.Click> event of the `&Open` <xref:System.Windows.Forms.ToolStripMenuItem>.  
 
 11. Within the event handler, insert code similar to the following code example to create and display new instances of `Form2` as MDI children of `Form1`.  
 
     ```vb  
     Private Sub openToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles openToolStripMenuItem.Click  
         Dim NewMDIChild As New Form2()  
         'Set the parent form of the child window.  
-            NewMDIChild.MdiParent = Me  
+        NewMDIChild.MdiParent = Me  
         'Display the new form.  
-            NewMDIChild.Show()  
+        NewMDIChild.Show()  
     End Sub  
     ```  
 
@@ -56,9 +56,9 @@ In some applications, the kind of a multiple-document interface (MDI) child wind
     {  
         Form2 newMDIChild = new Form2();  
         // Set the parent form of the child window.  
-            newMDIChild.MdiParent = this;  
+        newMDIChild.MdiParent = this;  
         // Display the new form.  
-            newMDIChild.Show();  
+        newMDIChild.Show();  
     }  
     ```