/usr/lib/aspell/x86_64-linux-gnu/nroff.amf is in libaspell15 0.60.7~20110707-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 | MODE nroff
ASPELL >=0.60.1
MAGIC /0:3:\.\/"/0/1/2/3/4/5/6/7/8/9/n/man/tmac
DESCRIPTION mode for checking Nroff documents
FILTER url
FILTER nroff
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