Correct the version of owncloud allowing migration

Signed-off-by: Marcel Müller <marcel-mueller@gmx.de>

Author: SystemKeeper

admin_manual/maintenance/migrating_owncloud.rst

@@ -17,7 +17,7 @@ See the table below for a version map, where migrating is easily possible:
 +===================+==============================+
 | 10.13.x           | 25.0.x (but at least 25.0.2) |
 +-------------------+------------------------------+
-| 10.0.5 or later   | 20.0.x (but at least 20.0.5) |
+| 10.5.x            | 20.0.x (but at least 20.0.5) |
 +-------------------+------------------------------+
 
 .. note:: Since ownCloud does not and will not support PHP 8.0 or higher, you