Fix spelling error (#5244)
Fix spelling error (#5244)

Tests are failing because of a misspelled word in a comment.

This fixes the spelling error.

Fixes: #5243
jsha/boulder,letsencrypt/boulder,bmw/boulder,jsha/boulder,jsha/boulder,bmw/boulder,letsencrypt/boulder,jcjones/boulder,jcjones/boulder,jcjones/boulder,jcjones/boulder,bmw/boulder,letsencrypt/boulder