Update ButtonBase.xml and Label.xml to indicate that AutoElipsis property shows control text in a tooltip (dotnet#7091)

Author: Tanya-Solyanik

xml/System.Windows.Forms/ButtonBase.xml

@@ -120,7 +120,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- Set <xref:System.Windows.Forms.ButtonBase.AutoEllipsis%2A> to `true` to display text that extends beyond the width of the control when the user passes over the control with the mouse. You must set the control's `AutoSize` property to `false` if you want <xref:System.Windows.Forms.ButtonBase.AutoEllipsis%2A> to be `true`. If `AutoSize` is `true`, the control will grow to fit the text and an ellipsis will not appear.  
+ Set <xref:System.Windows.Forms.ButtonBase.AutoEllipsis%2A> to `true` to display text that extends beyond the width of the control as a tooltip when the user passes over the control with the mouse. You must set the control's `AutoSize` property to `false` if you want <xref:System.Windows.Forms.ButtonBase.AutoEllipsis%2A> to be `true`. If `AutoSize` is `true`, the control will grow to fit the text and an ellipsis will not appear.  
   
  ]]></format>
         </remarks>

xml/System.Windows.Forms/Label.xml

@@ -169,7 +169,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- Set <xref:System.Windows.Forms.Label.AutoEllipsis%2A> to `true` to display text that extends beyond the width of the <xref:System.Windows.Forms.Label> when the user passes over the control with the mouse. If <xref:System.Windows.Forms.Label.AutoSize%2A> is `true`, the label will grow to fit the text and an ellipsis will not appear.  
+ Set <xref:System.Windows.Forms.Label.AutoEllipsis%2A> to `true` to display text that extends beyond the width of the <xref:System.Windows.Forms.Label> in a tooltip when the user passes over the control with the mouse. If <xref:System.Windows.Forms.Label.AutoSize%2A> is `true`, the label will grow to fit the text and an ellipsis will not appear.  
   
 > [!IMPORTANT]
 >  If the font is taller than the height of the <xref:System.Windows.Forms.Label> and <xref:System.Windows.Forms.Label.AutoEllipsis%2A> is `true`, you must set <xref:System.Windows.Forms.Label.AutoSize%2A> to `false` for text to be drawn.