A devise of the land of the testator, or of the land of the testator in any place, or in the occupation of any person mentioned in his will, or otherwise described in a general manner, and any other general devise which would describe a leasehold estate, if the testator had no freehold estate which could be described by it, shall be construed to include his leasehold estates, or any of them to which such description shall extend, as well as freehold estates, unless a contrary intention shall appear by the will.