The cuse example didn't work because sysrc can't have spaces between the operator. While here, extraneous quoting promotes unnecessary typing and misunderstanding of what quoting does and where it's required, so remove it. In this instance, making sure quoting is appropriate in rc.conf is one of the main things sysrc handles for you, so I think this improves the quality of the instruction.
If this is acceptable, please git commit --amend --author="Alexander Ziaee <concussious@runbox.com>" --no-edit, thanks!