docs: Update openfeature_python.md

[shigwata]

Description

The sample code was not working.

Closes issue(s)

Resolve #

Checklist

• I have tested this code
• I have added unit test to cover this code
• I have updated the documentation (README.md and /website/docs)
• I have followed the contributing guide

[netlify]

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

Name	Link
🔨 Latest commit	80e68b9
🔍 Latest deploy log	https://app.netlify.com/sites/go-feature-flag-doc-preview/deploys/67cff09f0ef046000816dd62

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.66%. Comparing base (b48252f) to head (80e68b9).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3200   +/-   ##
=======================================
  Coverage   85.66%   85.66%           
=======================================
  Files         115      115           
  Lines        5475     5475           
=======================================
  Hits         4690     4690           
  Misses        615      615           
  Partials      170      170           

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[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