Improve table display in documentation

[mloiseleur]

What does this PR do?

Improve table display in documentation.

Before

After

Motivation

I was testing the support of the Nginx provider with the Helm Chart. I was unable to read and find out what I can configure because of this table display, so I took the time to try to improve the situation.

More

• [x] Added/updated documentation

Additional Notes

I tried to fix it first with a local <style> into the page, but I did not succeed. This change impact the display of all tables in the documentation.