docs: small optimization

[mfranzke]

What does this PR do?

after installing a node version via nvm that version is automatically being used.

Mandatory Tasks (DO NOT REMOVE)

• [x] I have self-reviewed the code (A decent size PR without self-review might be rejected).
• [x] ~I have updated the developer docs in /docs if this PR makes changes that would require a documentation change. If N/A, write N/A here and check the checkbox.~ -> N/A
• [x] ~I confirm automated tests are in place that prove my fix is effective or that my feature works.~ -> N/A

How should this be tested?

It's a simple optimization to the documentation, so there's nothing really to test for.

Checklist

• I haven't checked if my changes generate no new warnings