According to the SPDX documentation, it should be "spdxdocs" not
"spdxdoc"
[YOCTO #15398]
(From OE-Core rev: d1b25413ced62dc2927dae57b8d16e67d15dc220)
Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>