fix: links in configuring projects doc (#10710)

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## Summary

<!-- What's the purpose of the change? What does it do, and why? -->

Fix invalid links in [configuring
projects](https://docs.astral.sh/uv/concepts/projects/config/#entry-points)
doc.

## Test Plan

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.gitignore

@@ -35,3 +35,7 @@ profile.json
 
 # macOS
 **/.DS_Store
+
+# IDE
+.idea
+.vscode

docs/concepts/projects/config.md

@@ -22,9 +22,9 @@ affects selection of dependency versions (they must support the same Python vers
 [Entry points](https://packaging.python.org/en/latest/specifications/entry-points/#entry-points) are
 the official term for an installed package to advertise interfaces. These include:
 
-- [Command line interfaces]()
-- [Graphical user interfaces]()
-- [Plugin entry points]()
+- [Command line interfaces](#command-line-interfaces)
+- [Graphical user interfaces](#graphical-user-interfaces)
+- [Plugin entry points](#plugin-entry-points)
 
 !!! important