fix some typos

From /dev/humancontroller.

code/game/g_main.c

@@ -1083,7 +1083,7 @@ void ExitLevel (void) {
 		cl->ps.persistant[PERS_SCORE] = 0;
 	}
 
-	// we need to do this here before chaning to CON_CONNECTING
+	// we need to do this here before changing to CON_CONNECTING
 	G_WriteSessionData();
 
 	// change all client states to connecting, so the early players into the

code/server/sv_main.c

@@ -333,7 +333,7 @@ Informs all masters that this server is going down
 =================
 */
 void SV_MasterShutdown( void ) {
-	// send a hearbeat right now
+	// send a heartbeat right now
 	svs.nextHeartbeatTime = -9999;
 	SV_MasterHeartbeat(HEARTBEAT_FOR_MASTER);