Redux Essentials RTKQuery can now be updated to mention the released devtools RTKQuery dock

[wesen]

What docs page needs to be fixed?

• Section: Redux Essentials
• Page: RTKQuery Basic

What is the problem?

In RTKQuery basics,
the devtools extension to view RTKQuery is mentioned as being a WIP. It has since been released in devtools 3.0.0

What should be changed to fix the problem?

Replace the mention of WIP with a description of the devtools feature.

[timdorr]

Could you make a PR to change this?