Local tutorial corrections

**Describe the bug**
Local tutorial on a fresh Mac doesn't work, it needs additional steps.

**Environment (please complete the following information):**
- Operating System and Version: macOS 10.15.7 (Catalina)
- Hardware: Macbook Pro 2015 / i7 2.6GHz / 32 GB RAM

**Additions & corrections to the tutorial**
* before calling `brew cask install docker-edge` the following was required, otherwise brew couldn't find this cask:
`brew tap homebrew/cask-versions`

* when you first run the Docker.app you need to check "Enable Kubernetes" in the Kubernetes tab, and "Apply & Restart".

* "visiting the Kubernetes dashboard" - for a Kubernetes newbie this is totally cryptic, it should probably direct the user to the later section on installing the dashboard.

* "Create a collection" section should probably add `?commit=true` when indexing new docs to make them immediately visible for searching. For Solr newbies it may be confusing that search will still return 0 docs for a while.

* following the example "scaling up" section, adding more (docker) replicas resulted in some instability - occasionally instead of 5 it would show 4 nodes, and the `kubectl proxy` would show:
`http: proxy error: context canceled`

Start by locating the local tutorial and following it on macOS with Docker and Kubernetes enabled. Check each reported step, including Homebrew setup, dashboard guidance, document indexing, and scaling; done means the tutorial is corrected and the replica/proxy behavior is either resolved or clearly documented.

Written by the indexing model from the issue text.