Fix typo in Lightweight installation under tips_and_tricks

[angelonazzaro]

What does this PR do?

This PR fixes a typo under the Lightweight installation subsection in the Tips and Tricks page.

Fixes
Replaced the following phrase: "Then, you can BERTopic without needing to have a CPU" with "Then, you can BERTopic without needing to have a GPU".

Before submitting

• [✅ ] This PR fixes a typo or improves the docs (if yes, ignore all other checks!).
• Did you read the contributor guideline?
• Was this discussed/approved via a Github issue? Please add a link to it if that's the case.
• Did you make sure to update the documentation with your changes (if applicable)?
• Did you write any new necessary tests?

[MaartenGr]

Oh, that's a horrible typo! Apologies for the delay, and thank you for catching this.