doc: add proper link for ssh cloning

[sorinlzr]

Checklist

• [x] I have followed (at least) the PR section of the contributing guide.
• [ ] I fixed all necessary PR warnings
• [x] The commit history is clean
• [ ] The E2E tests are passing
• [ ] If possible, the issue has been divided into more subtasks
• [x] I did a self review before requesting a review from another team member

Description

I was looking at the documentation in order to set up a local TruBudget environment and I noticed that the url for the ssh section was actually the https one, thought it would be good to change it

[stale[bot]]

This issue has been automatically marked as stale because it has not had activity for 30 days. It will be closed if no further activity occurs. Thank you for your contributions.

[galethil]

@sorinlzr Thank you for the correction of url.