docs: add a note about wildcards in the installation doc page
docs: add a note about wildcards in the installation doc page

Closes #4257

dokku/dokku,claytonbrown/dokku,dokku/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,progrium/dokku,progrium/dokku,claytonbrown/dokku,dokku/dokku,dokku/dokku,claytonbrown/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,progrium/dokku,claytonbrown/dokku,progrium/dokku,dokku/dokku,claytonbrown/dokku,progrium/dokku