Merge pull request #16180 from thockin/docs-nits

docs/admin/authentication.md

@@ -49,7 +49,7 @@ The token file format is implemented in `plugin/pkg/auth/authenticator/token/tok
 and is a csv file with a minimum of 3 columns: token, user name, user uid, followed by
 optional group names. Note, if you have more than one group the column must be double quoted e.g.
 
-```csv
+```
 token,user,uid,"group1,group2,group3"
 ```