fix typo in vref doc
treec777f6a9e5ad94662bd3bf8c9f254615f9a1e3fa
-rw-r--r-- 6 .gitignore
-rw-r--r-- 993 2021-07-who-uses.txt
drwxr-xr-x - archive
drwxr-xr-x - bin
drwxr-xr-x - docs
-rw-r--r-- 2569 mkdocs.yml