Refine ServerFacade class description in pregame.md

Clarified the description of the ServerFacade class by rephrasing the sentence about handling HTTP requests and responses.

Author: jclegg03

chess/5-pregame/pregame.md

@@ -6,7 +6,7 @@
 
 In this part of the Chess Project, you will create an initial version of your Chess client. Your Chess client will be a terminal-based (i.e., console-based) program that gives the user a simple interface for playing Chess. Your client should implement all user interactions that occur outside of actually playing a game. Game play interactions will be implemented in the next phase. This includes allowing the user to display help text, register, login, list existing games, create a new game, play a game, observe a game, logout, and exit. You will also write the client code that draws the chessboard.
 
-To implement this, you will create a ServerFacade class to handle sending and recieving HTTP requests to and from your server. Your client code will then use your ServerFacade methods to make server API calls.
+To implement this, you will create a ServerFacade class to handle sending HTTP requests to your server and receiving responses from it. Your client code will then use your ServerFacade methods to make server API calls.
 
 
 ## Getting Started