Add seleniummanager examples with filesystem download explanations

[ojintoad]

Add code samples and file download explanations

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Description

Adds two examples for how SeleniumManager obtains files for chromedriver

Motivation and Context

This helped me understand how the automatic behavior functions which may help others

Types of changes

• [ ] Change to the site (I have double-checked the Netlify deployment, and my changes look good)
• [ ] Code example added (and I also added the example to all translated languages)
• [ ] Improved translation
• [ ] Added new translation (and I also added a notice to each document missing translation)

Checklist

• [ ] I have read the contributing document.
• [ ] I have used hugo to render the site/docs locally and I am sure it works.

[netlify[bot]]

👷 Deploy request for selenium-dev pending review.

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Name	Link
🔨 Latest commit	fd47bb6163370efb9f8153befafa124b60261282

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[diemol]

I am going to close this as I interpret the comments as this PR was not adding value to the docs.