Update README.md

[skarampatakis]

Fix typo on Special Env Vars section

Checklist

• The PR title is short and expressive.
• I have updated the CHANGELOG.md. Hints on formulation: Important information first, details second.
• I have updated the Deployment Migration Notes Section in the CHANGELOG.md for any configuration / external API changes.
• I have updated the Community Edition Postman-Collection if I changed existing APIs or added new APIs (e.g. for Management-API or API-Wrapper)
• I have performed a self-review
• I understand that my contributions will be contributed under the Contributor License Agreement (CLA) which has to be agreed to on your first contribution.
• I have added / adjusted Apache 2.0 license headers to files *.ts, *.kts, *.kt, *.java and marked anything else of relevance in the NOTICE file.

[CLAassistant]

All committers have signed the CLA.

[ghost]

Hello and thank you for the PR. We will clarify internally how to proceed.