core: move comments with description of C file to top of files

src/plugins/irc/irc-command.c

@@ -1,4 +1,6 @@
 /*
+ * irc-command.c - IRC commands
+ *
  * Copyright (C) 2003-2012 Sebastien Helleu <flashcode@flashtux.org>
  * Copyright (C) 2006 Emmanuel Bouthenot <kolter@openics.org>
  *
@@ -18,10 +20,6 @@
  * along with WeeChat.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-/*
- * irc-command.c: IRC commands
- */
-
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>