fix broken link of UI test in the book (#14077)

r? flip1995

changelog: none

Author: flip1995

book/src/development/basics.md

@@ -75,7 +75,7 @@ or if you modify a test file to add a test case.
 > _Note:_ This command may update more files than you intended. In that case
 > only commit the files you wanted to update.
 
-[UI test]: https://rustc-dev-guide.rust-lang.org/tests/adding.html#guide-to-the-ui-tests
+[UI test]: https://rustc-dev-guide.rust-lang.org/tests/adding.html#ui-test-walkthrough
 
 ## `cargo dev`