message: docs: add link to base class
diff: @@ -307,6 +307,8 @@ export class ConfigIndex extends Command {
  # Other Command Options
  +[See the base class to get an idea of what methods can be called on a command](https://github.com/oclif/command/blob/master/src/command.ts).
  +
  ```js
  import Command, {flags} from '@oclif/command'
  