docs: add exp config for unmanaged example #2.

[ioga]

Description

Add an exp config file for unmanaged example #2 for "checkpoints". It is trivial, but I had a support conversation about it. Let's add to avoid that conversation in the future.

Test Plan

N/A

Checklist

• Changes have been manually QA'd
• User-facing API changes need the "User-facing API Change" label.
• Release notes should be added as a separate file under docs/release-notes/.
  See Release Note for details.
• Licenses should be included for new code which was copied and/or modified from any external code.

[netlify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 46.08%. Comparing base (d4e23f4) to head (92b512f).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #9397   +/-   ##
=======================================
  Coverage   46.07%   46.08%           
=======================================
  Files        1228     1228           
  Lines      155900   155900           
  Branches     2439     2439           
=======================================
+ Hits        71837    71840    +3     
+ Misses      83872    83869    -3     
  Partials      191      191           

Flag	Coverage Δ
backend	42.02% <ø> (+<0.01%)	⬆️
harness	64.07% <ø> (ø)
web	38.24% <ø> (ø)

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see 5 files with indirect coverage changes