Update SBBSecho AreaMgr help:

- Removed "%FROM" (not supported)
- Added "%RESCAN <areaname>" (new feature)
- Clarified "%RESCAN" purpose ("scan all connected areas")

exec/areamgr.hlp

@@ -9,12 +9,12 @@ In the body of the message to Area Manager:
 %LIST                 Request a list of areas available to you
 %QUERY                Request a list of areas to which you are connected
 %UNLINKED             Request a list of areas to which you are not connected
-%COMPRESSION <type>   Change the compression type (ARC/ARJ/LZH/PAK/SQZ/ZIP/ZOO)
+%COMPRESSION <type>   Change the compression type (e.g. ARC/ARJ/LZH/PAK/SQZ/ZIP/ZOO)
 %PASSWORD <password>  Change your AreaMgr password
-%RESCAN 	      Request a rescan of newly added areas
+%RESCAN 	      Request a rescan of all connected areas
+%RESCAN <areaname>    Request a rescan of a single connected area
 %ACTIVE 	      Reconnect all temporarily disconnected areas
 %PASSIVE	      Temporarily disconnect all connected areas
-%FROM <address>       Remote maintenance, must be the first command
 %+ALL		      Connect all available areas
 %-ALL		      Disconnect all areas
 [---]                 Everything below the tear line is ignored