docs: Add Fumadocs to downstream projects page

Author: pawamoy

docs/downstream-projects.md

@@ -1,11 +1,15 @@
 # Downstream projects
 
-Griffe is used by various projects in the Python ecosystem.
+Griffe is used by various projects in the Python ecosystem. They are listed below in alphabetical order.
 
 ## api2mdx
 
 [api2mdx](https://github.com/Mirascope/api2mdx) is a Python tool that generates `mdx` documentation for Python APIs. Under the hood, it uses Griffe.
 
+## Fumadocs
+
+[Fumadocs](https://fumadocs.dev/) is a beautiful documentation framework for developers, flexible, performant, running on your React framework. It uses Griffe to extract and render Python API documentation.
+
 ## griffe2md
 
 [griffe2md](https://mkdocstrings.github.io/griffe2md/) outputs API docs in Markdown. It uses Griffe to load the data, and then use Jinja templates to render documentation in Markdown, just like [mkdocstrings-python](https://mkdocstrings.github.io/python/), but in Markdown instead of HTML.
@@ -48,7 +52,7 @@ The [OpenAI Agents SDK](https://github.com/openai/openai-agents-python) is a lig
 
 ## rafe
 
-[rafe](https://pypi.org/project/rafe/) is a tool for inspecting Python environments and building packages (irrespective of language) in a reproducible manner. It wraps Griffe to provide a CLI command to check for API breaking changes.
+[rafe](https://pypi.org/project/rafe/) is a tool for inspecting Python environments and building packages (irrespective of the language) in a reproducible manner. It wraps Griffe to provide a CLI command to check for API breaking changes.
 
 ## Yapper