swupdate.bbclass: fix typo in comments
swupdate.bbclass: fix typo in comments

Fix explicitely -> explicitly

Signed-off-by: Luca Ceresoli <a05bd890c4868ea1807f8564055d1fba77c6ba81@lucaceresoli.net>
Acked-by: Stefano Babic <2c2905e0c2877c7e4ce40c7425e972302953fda5@denx.de>

sbabic/meta-swupdate,sbabic/meta-swupdate