Changes comments/references for visualization install

[skrawcz]

Changing references of:

pip install sf-hamilton[visualization]
to:
pip install "sf-hamilton[visualization]"

Because zsh users need the quotes, and the quotes
are backwards compatible with bash so I'm thinking this is the better way to list it.

Changes

• just documentation changes

How I tested this

• N/A

Notes

• Fixes part of docs clarifying suggestions #288

Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.