docs(helm): Update relay proxy helm README

[thomaspoignant]

Automated pull request to update relay-proxy helm chart README

[netlify]

✅ Deploy Preview for go-feature-flag-doc-preview canceled.

Name	Link
🔨 Latest commit	e7dd814
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/67cb86dd3d580d000845e3f4

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.66%. Comparing base (e814b81) to head (e7dd814).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3175   +/-   ##
=======================================
  Coverage   85.66%   85.66%           
=======================================
  Files         115      115           
  Lines        5475     5475           
=======================================
  Hits         4690     4690           
  Misses        615      615           
  Partials      170      170           

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