Remove reference to nonexisting parameter in PipeReader.CopyToAsync summary (#10287)

Author: rzikm

xml/System.IO.Pipelines/PipeReader.xml

@@ -296,7 +296,7 @@ The canceled <xref:System.IO.Pipelines.PipeReader.ReadAsync(System.Threading.Can
       <Docs>
         <param name="destination">The pipe writer to which the contents of the current stream will be copied.</param>
         <param name="cancellationToken">The token to monitor for cancellation requests. The default value is <see cref="P:System.Threading.CancellationToken.None" />.</param>
-        <summary>Asynchronously reads the bytes from the <see cref="T:System.IO.Pipelines.PipeReader" /> and writes them to the specified <see cref="T:System.IO.Pipelines.PipeWriter" />, using a specified buffer size and cancellation token.</summary>
+        <summary>Asynchronously reads the bytes from the <see cref="T:System.IO.Pipelines.PipeReader" /> and writes them to the specified <see cref="T:System.IO.Pipelines.PipeWriter" />, using a specified cancellation token.</summary>
         <returns>A task that represents the asynchronous copy operation.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.OperationCanceledException">The cancellation token was canceled. This exception is stored into the returned task.</exception>