docs: add example links

packages/noco-docs/docs/020.getting-started/020.environment-variables.md

@@ -12,7 +12,7 @@ For production usecases, it is **recommended** to configure
 
 | Variable | Comments | If absent |
 |---|---|---|
-| NC_DB | See our database URLs | A local SQLite will be created in root folder if `NC_DB` is not provided |
+| NC_DB | See our example database URLs [here](https://github.com/nocodb/nocodb#docker). | A local SQLite will be created in root folder if `NC_DB` is not provided |
 | NC_DB_JSON | Can be used instead of `NC_DB` and value should be valid knex connection JSON |  |
 | NC_DB_JSON_FILE | Can be used instead of `NC_DB` and value should be a valid path to knex connection JSON |  |
 | DATABASE_URL | JDBC URL Format. Can be used instead of NC_DB. |  |