Update pipe.mdx

docs/features/plugin/functions/pipe.mdx

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 title: "🚰 Pipe Function"
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-# 🚰 Pipe Function: Extending Open WebUI with Custom Logic
+# 🚰 Pipe Function: Custom Model/Agent
 
 Welcome to this guide on creating **Pipes** in Open WebUI! Think of Pipes as a way to **adding** a new model to Open WebUI. In this document, we'll break down what a Pipe is, how it works, and how you can create your own to add custom logic and processing to your Open WebUI models. We'll use clear metaphors and go through every detail to ensure you have a comprehensive understanding.