Remove file comment in "src/dwm.c"

Because it no longer describes the code,
that has changed a lot.

src/dwm.c

@@ -1,25 +1,3 @@
-/* See LICENSE file for copyright and license details.
- *
- * Polytree tiling window manager is designed like any other X client as well.
- * It is driven through handling X events. In contrast to other X clients, a
- * window manager selects for SubstructureRedirectMask on the root window, to
- * receive events about window (dis-)appearance. Only one X connection at a time
- * is allowed to select for this event mask.
- *
- * The event handlers of PolytreeWM are organized in an array which is accessed
- * whenever a new event has been fetched. This allows event dispatching
- * in O(1) time.
- *
- * Each child of the root window is called a client, except windows which have
- * set the override_redirect flag. Clients are organized in a linked client
- * list on each monitor, the focus history is remembered through a stack list
- * on each monitor. Each client contains a bit array to indicate the tags of a
- * client.
- *
- * Keys and tagging rules are organized as arrays and defined in config.h.
- *
- * To understand everything else, start reading main().
- */
 #include <locale.h>
 #include <signal.h>
 #include <stdarg.h>