docs(website): fix invalid markdown

[mroderick]

Description

This PR fixes a minor error in the markdown of the "Using Open Feature SDKs" pages.

Before

After

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

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[thomaspoignant]

@mroderick good catch thank you 🙏🏻

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.00%. Comparing base (8f9ccb8) to head (1bcb76f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2290   +/-   ##
=======================================
  Coverage   86.00%   86.00%           
=======================================
  Files         102      102           
  Lines        3731     3731           
=======================================
  Hits         3209     3209           
  Misses        399      399           
  Partials      123      123           

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