Fix atcommands.txt ban > Charban

doc/atcommands.txt

@@ -1310,7 +1310,7 @@ Bans or unbans a player for a limited time.
 Time elements: y/a, m, d/j, h, mn, s
 
 Example:
-@ban +2d Char2
+@charban +2d Char2
 -> bans Char2's for 2 days.
 
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