Change header from H3 to H2 for clarity

[damians-filigran]

Update header level for Playbook-Based Scout Query Enrichment section in README.

Proposed changes

Related issues

Checklist

• I consider the submitted work as finished
• [-] I have signed my commits using GPG key.
• I tested the code for its functionality using different use cases
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

[filigran-cla-bot]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.22%. Comparing base (97761b2) to head (dfa00d6).
⚠️ Report is 1 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (97761b2) and HEAD (dfa00d6). Click for more details.

HEAD has 93 uploads less than BASE

Flag	BASE (97761b2)	HEAD (dfa00d6)
connectors	95	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #6297       +/-   ##
===========================================
- Coverage   40.49%    0.22%   -40.28%     
===========================================
  Files        2140     1664      -476     
  Lines      128223   100081    -28142     
===========================================
- Hits        51927      225    -51702     
- Misses      76296    99856    +23560     

Flag	Coverage Δ
baseline	0.00% <ø> (ø)
connectors	60.48% <ø> (-13.58%)	⬇️

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