_content/ref/mod: fix typo
_content/ref/mod: fix typo

Change-Id: I5581e2e62ab449826cc6086cd1948fdd7021563f
GitHub-Last-Rev: f1e468fb0c1cebd889b42ee83d7b393089f978c7
GitHub-Pull-Request: golang/website#99
Reviewed-on: https://go-review.googlesource.com/c/website/+/355030
Reviewed-by: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Trust: Daniel Martí <29bf28b42a938ace12a5819da4ed4ba03d82f315@mvdan.cc>
Trust: Alberto Donizetti <90b16103a35511ced020676f3544f17117fb4c92@gmail.com>

golang/website,golang/website,golang/website,golang/website,golang/website,golang/website,golang/website