Query stats doc

[Dfinity-skaestle]

Thank you for your contribution to the IC Developer Portal. Before submitting your Pull Request, please make sure that:

• [x] You have updated the .github/CODEOWNERS file according to your changes.
• [x] You have registered new documents to /sidebars.js if any.

[sa-github-api]

Dear @Dfinity-skaestle,

In order to potentially merge your code in this open-source repository and therefore proceed with your contribution, we need to have your approval on DFINITY's CLA.

If you decide to agree with it, please visit this issue and read the instructions there. Once you have signed it, re-trigger the workflow on this PR to see if your code can be merged.

— The DFINITY Foundation

[jessiemongeon1]

CLA check fails due to @Dfinity-skaestle account no longer being part of DFINITY group. Bypassing branch protection to merge, since this PR was created when Stefan Kaestle was still at DFINITY.