Remove mention from DataGridCell.xml of being able to set DataGridCell.IsReadOnly

Author: adamint

xml/System.Windows.Controls/DataGridCell.xml

@@ -206,7 +206,7 @@
           <format type="text/markdown"><![CDATA[  
   
 ## Remarks  
- Set the <xref:System.Windows.Controls.DataGridCell.IsReadOnly%2A> property to `true` to make an individual cell read-only. Set the <xref:System.Windows.Controls.DataGridColumn.IsReadOnly%2A?displayProperty=nameWithType> property to `true` to make all cells in an individual column read-only. Set the <xref:System.Windows.Controls.DataGrid.IsReadOnly%2A?displayProperty=nameWithType> property to `true` to make all cells in the <xref:System.Windows.Controls.DataGrid> read-only If there is a conflict between the settings at the <xref:System.Windows.Controls.DataGrid>, column, and cell levels, a value of `true` takes precedence over a value of `false`.  
+ Set the <xref:System.Windows.Controls.DataGridColumn.IsReadOnly%2A?displayProperty=nameWithType> property to `true` to make all cells in an individual column read-only. Set the <xref:System.Windows.Controls.DataGrid.IsReadOnly%2A?displayProperty=nameWithType> property to `true` to make all cells in the <xref:System.Windows.Controls.DataGrid> read-only If there is a conflict between the settings at the <xref:System.Windows.Controls.DataGrid>, column, and cell levels, a value of `true` takes precedence over a value of `false`.  
   
  ]]></format>
         </remarks>