Fix remaining instance of @file attribute
Fix remaining instance of @file attribute

Amends 1231b8b per dita-ot/dita-ot#3300

Signed-off-by: Roger Sheen <a61a1add71dadc74037ae5e44ee30713db9a7451@infotexture.net>

infotexture/docs,infotexture/docs,dita-ot/docs