Adding hyphen to command-line arguments + rewording

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

Author: noellie-velez

com.unity.netcode.gameobjects/Documentation~/command-line-arguments.md

@@ -1,6 +1,6 @@
 # Command-line arguments
 
-You can use [command line arguments](https://docs.unity3d.com/Documentation/Manual/CommandLineArguments.html) to configure certain aspects of your game at launch. This is especially useful for dedicated server builds, where arguments let you override default network settings such as the IP address and port.
+Use [command-line arguments](https://docs.unity3d.com/Documentation/Manual/CommandLineArguments.html) to configure certain aspects of your game at launch. This is especially useful for dedicated server builds, where arguments let you override default network settings such as the IP address and port.
 
 ## Using Command Line Arguments