Update README.md

Author: simonbs

README.md

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 <h3>👋 Welcome to Framna Docs</h3>
-<h4>Self-hosted web portal that collects OpenAPI documentation and facilitates spec-driven development, built with GitHub-based authorization.</h4>
+<h4>Self-hosted web portal that centralizes OpenAPI documentation and facilitates spec-driven development, built with GitHub-based authorization.</h4>
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