Open file dialog io exception Fixes #7998 (#10198)

* Update OpenFileDialog.xml about IOException

* vocabulary fix

* PR fix as recomended

Author: BlueBles

xml/System.Windows.Forms/OpenFileDialog.xml

@@ -47,9 +47,7 @@
 On a right-to-left operating system, setting the containing form's <xref:System.Windows.Forms.Control.RightToLeft> property to <xref:System.Windows.Forms.RightToLeft.Yes?displayProperty=nameWithType> localizes the dialog's **File Name**, **Open**, and **Cancel** buttons. If the property is not set to <xref:System.Windows.Forms.RightToLeft.Yes?displayProperty=nameWithType>, English text is used instead.  
 
  If you want to give the user the ability to select a folder instead of a file, use <xref:System.Windows.Forms.FolderBrowserDialog> instead.  
-  
-   
-  
+ 
 ## Examples  
  The following code example creates an <xref:System.Windows.Forms.OpenFileDialog>, sets several properties to define the file extension filter and dialog behavior, and displays the dialog box using the <xref:System.Windows.Forms.CommonDialog.ShowDialog%2A?displayProperty=nameWithType> method. The example requires a form with a <xref:System.Windows.Forms.Button> placed on it and a reference to the <xref:System.IO> namespace added to it.  
   
@@ -235,6 +233,7 @@ On a right-to-left operating system, setting the containing form's <xref:System.
  ]]></format>
         </remarks>
         <exception cref="T:System.ArgumentNullException">The file name is <see langword="null" />.</exception>
+        <exception cref="T:System.IO.IOException">An I/O error occurred while opening the file.</exception>
         <altmember cref="T:System.IO.Stream" />
         <altmember cref="P:System.Windows.Forms.OpenFileDialog.CheckFileExists" />
         <altmember cref="P:System.Windows.Forms.OpenFileDialog.ReadOnlyChecked" />