Fix xref encoding for FileStream.Flush method reference

Co-authored-by: gewarren <[email protected]>

Author: Copilot

xml/System.IO/FileStream.xml

@@ -2870,7 +2870,7 @@ Calling `DisposeAsync` allows the resources used by the <xref:System.IO.FileStre
           <format type="text/markdown"><![CDATA[
 
 ## Remarks
- This method flushes the .NET stream buffers to the file, but does not flush intermediate file buffers in the operating system. To ensure that all buffered data is written to the underlying storage device, use the <xref:System.IO.FileStream.Flush(System.Boolean)> method with the `flushToDisk` parameter set to `true`.
+ This method flushes the .NET stream buffers to the file, but does not flush intermediate file buffers in the operating system. To ensure that all buffered data is written to the underlying storage device, use the <xref:System.IO.FileStream.Flush%28System.Boolean%29> method with the `flushToDisk` parameter set to `true`.
 
  If the operation is canceled before it completes, the returned task contains the <xref:System.Threading.Tasks.TaskStatus.Canceled> value for the <xref:System.Threading.Tasks.Task.Status%2A> property. If the handle to the file is disposed, the returned task contains the <xref:System.ObjectDisposedException> exception in the <xref:System.Threading.Tasks.Task.Exception%2A> property.