====== OnUpdatedSign hook callback function ======
OnUpdatedSign() is called when a sign is to be updated. This is a notification-only hook, plugins wishing to manipulate the sign text should use the [[API:plugin:OnUpdatingSign|OnUpdatingSign]]() hook.

===== Function signature =====
<code lua>
function OnUpdatedSign(World, BlockX, BlockY, BlockZ, Line1, Line2, Line3, Line4, Player)
</code>
Parameters:
| World | [[API:cWorld|cWorld]] | The world in which the sign resides |
| BlockX | number | X-coord of the sign |
| BlockY | number | Y-coord of the sign |
| BlockZ | number | Z-coord of the sign |
| Line1 | string | First line of the sign text |
| Line2 | string | Second line of the sign text |
| Line3 | string | Third line of the sign text |
| Line4 | string | Fourth line of the sign text |
| Player | [[API:cPlayer|cPlayer]] | The player who is changing the sign. May be nil if not by a player |

===== Return values =====
If the function returns false or no value, other plugins' callbacks are called. If the function returns true, no other callbacks are called for this event.

===== Registering the callback =====
To register your plugin to receive a callback through this function, use the hook [[api:plugin:hooks|HOOK_UPDATED_SIGN]]
<code lua>
cPluginManager:Get():AddHook(Plugin, cPluginManager.HOOK_UPDATED_SIGN);
</code>
