docs(event_handler): add information about case-insensitive header lookup function

[pgrzesik]

Issue number: #3142

Summary

Slightly improved documentation about case-insensitive lookup of specific header values for REST API events.

Changes

As above, slight changes to docs only

User experience

Improved documentation

Checklist

If your change doesn't seem to apply, please leave them unchecked.

• Meet tenets criteria
• I have performed a self-review of this change
• Changes have been tested
• Changes are documented
• PR title follows conventional commit semantics

Is this a breaking change?

RFC issue number:

Checklist:

• Migration process documented
• Implement warnings (if it can live side by side)

Acknowledgment

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[boring-cyborg]

Thanks a lot for your first contribution! Please check out our contributing guidelines and don't hesitate to ask whatever you need.
In the meantime, check out the #python channel on our Powertools for AWS Lambda Discord: Invite link

[leandrodamascena]

Hi @pgrzesik! I left a comment with a suggestion to transform the text into a more active voice and tell the customer what they should do to achieve the result they want. Make sense?
Thank you for sending this PR. Improving our documentation from customer feedback is something we work hard on every day.

[pgrzesik]

Thank you for the suggestion @leandrodamascena, I just accepted it 🙌

[leandrodamascena]

Hi @pgrzesik! This PR seems simple because we just changed a line, but the discussions that brought us here were complex and you could find a simple and effective solution. This is priceless, we really appreciate this.

Approved!

merging

[heitorlessa]

looks great, thank you so much @pgrzesik!

@leandrodamascena before we merge, we need to fix the docstring in the get_header_value function to signal that by default we make a case-insensitive lookup*

[leandrodamascena]

looks great, thank you so much @pgrzesik!

@leandrodamascena before we merge, we need to fix the docstring in the get_header_value function to signal that by default we make a case-insensitive lookup*

Hey @heitorlessa - https://github.com/aws-powertools/powertools-lambda-python/pull/3183/files#diff-201518b4cf27a31cff68870554e0b4e2d6de2fa18456d2ea85d04d156991600cR192

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (e555df1) 95.96% compared to head (933d3d9) 95.96%.
Report is 3 commits behind head on develop.

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Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #3183   +/-   ##
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  Coverage    95.96%   95.96%           
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  Files          195      195           
  Lines         8381     8381           
  Branches      1562     1562           
========================================
  Hits          8043     8043           
  Misses         276      276           
  Partials        62       62           

Files	Coverage Δ
...lambda_powertools/utilities/data_classes/common.py	100.00% <ø> (ø)

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[boring-cyborg]

Awesome work, congrats on your first merged pull request and thank you for helping improve everyone's experience!