Fix parameter name in TcpClient.ConnectAsync exception annotations (#8786)

Author: rzikm

xml/System.Net.Sockets/TcpClient.xml

@@ -1425,7 +1425,7 @@ The `Available` property is a way to determine whether data is queued for readin
 
 ]]></format>
         </remarks>
-        <exception cref="T:System.ArgumentNullException">The <paramref name="hostname" /> parameter is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentNullException">The <paramref name="host" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="port" /> parameter is not between <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
         <exception cref="T:System.Net.Sockets.SocketException">An error occurred when accessing the socket.</exception>
         <exception cref="T:System.ObjectDisposedException">
@@ -1606,7 +1606,7 @@ The `Available` property is a way to determine whether data is queued for readin
 
 ]]></format>
         </remarks>
-        <exception cref="T:System.ArgumentNullException">The <paramref name="hostname" /> parameter is <see langword="null" />.</exception>
+        <exception cref="T:System.ArgumentNullException">The <paramref name="host" /> parameter is <see langword="null" />.</exception>
         <exception cref="T:System.ArgumentOutOfRangeException">The <paramref name="port" /> parameter is not between <see cref="F:System.Net.IPEndPoint.MinPort" /> and <see cref="F:System.Net.IPEndPoint.MaxPort" />.</exception>
         <exception cref="T:System.Net.Sockets.SocketException">An error occurred when accessing the socket.</exception>
         <exception cref="T:System.ObjectDisposedException">