Fix GetCurrentMonitor comments. (#4812)

src/platforms/rcore_template.c

@@ -208,7 +208,7 @@ int GetMonitorCount(void)
     return 1;
 }
 
-// Get number of monitors
+// Get current monitor where window is placed
 int GetCurrentMonitor(void)
 {
     TRACELOG(LOG_WARNING, "GetCurrentMonitor() not implemented on target platform");