Update index.adoc in FAQ

[Saurabh-Daware]

Description of change

• Bring What is this "Eclipse Temurin"? to the top
• Fix #2237

Checklist

• [ ] npm test passes
• [x] documentation is changed or added (if applicable)
• [x] contribution guidelines followed here

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.34%. Comparing base (6ea8d9a) to head (da4d86b). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #2917 +/- ## ======================================= Coverage 99.34% 99.34% ======================================= Files 90 90 Lines 6970 6970 Branches 611 611 ======================================= Hits 6924 6924 Misses 46 46 ```

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[xavierfacq]

The PR is up-to-date, so if the content is OK we can merge it.