[groff] [mom] documentation typo single-quote inline

[Marcus Atilius Regulus]

There seems to be a typo in mom's documentation:
https://schaffter.ca/mom/momdoc/inlines.html#inline-characters-groff

It says:
Open (left) single-quote    \[oq]
Close (right) single-quote  \[oq]

should be imo:
Close (right) single-quote  \[cq]