docs: fix typo (#79)

Author: rgimen3z

demo/main.py

@@ -13,7 +13,7 @@
 def api_index() -> list[AnyComponent]:
     # language=markdown
     markdown = """\
-This site providers a demo of [FastUI](https://github.com/pydantic/FastUI), the code for the demo
+This site provides a demo of [FastUI](https://github.com/pydantic/FastUI), the code for the demo
 is [here](https://github.com/pydantic/FastUI/tree/main/demo).
 
 The following components are demonstrated: