Added instructions to step 3 of standard installation.

[bryceparkman]

Fixes #6748 (<=== Add issue number here)

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[welcome]

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[sashadev-sky]

This is great, thanks! Just a small refactor to make it more intuitive and I also fixed the indentation for "4. Steps to install gems:". (and updated it to 5 in accordance with the previous changes)

Let me know if these change requests are ok with you!

Thank you @bryceparkman :)

[sashadev-sky]

Suggested change

	3. Enter the new **plots2** directory with `cd plots2`.
	3. Enter the new **plots2** directory with `cd plots2` and then enter `git remote add upstream https://github.com/publiclab/plots2.git` in the command line.
	3. Enter the new **plots2** directory with `cd plots2`.
	4. Set the upstream remote to the original repo url so that git knows where to fetch updates from in the future: `git remote add upstream https://github.com/publiclab/plots2.git`

[sashadev-sky]

Suggested change

	4. Steps to install gems:
	5. Steps to install gems:

[SidharthBansal]

As the person is inactive for more than a month, I am closing the PR. In case you want to push changes please feel free to open a new PR OR reopen this PR and add additional changes to it.
Thanks for contributing on Public Lab