Adding hyphen to command-line arguments

Co-authored-by: Amy Reeve <amy.reeve@unity3d.com>

Author: noellie-velez

com.unity.netcode.gameobjects/Documentation~/TableOfContents.md

@@ -19,7 +19,7 @@
     * [Max players](basics/maxnumberplayers.md)
   * [Transports](advanced-topics/transports.md)
   * [Unity Relay](relay/relay.md)
-  * [Command line arguments](command-line-arguments.md)
+  * [Command-line arguments](command-line-arguments.md)
 * [Network components](network-components.md)
   * [Core components](components/core/corecomponents.md)
     * [NetworkObject](components/core/networkobject.md)