some cleanup

Author: mark-i-m

src/SUMMARY.md

@@ -113,6 +113,4 @@
 
 ---
 
-[](./important-links.md)
-
 [pau]: ./borrow_check/region_inference/placeholders_and_universes.md

src/implementing_new_features.md

@@ -178,5 +178,5 @@ a new unstable feature:
 [`feature_gate::check::check_crate`]: https://doc.rust-lang.org/nightly/nightly-rustc/syntax/feature_gate/check/fn.check_crate.html
 [value the stability of Rust]: https://github.com/rust-lang/rfcs/blob/master/text/1122-language-semver.md
 [stability in code]: #stability-in-code
-[here]: https://rust-lang.github.io/rustc-guide/stabilization_guide.html
+[here]: ./stabilization_guide.md
 [tracking issue]: #tracking-issue

src/important-links.md

@@ -123,7 +123,7 @@ exists in the test file. For example, you can run all the tests in
 By passing `--pass $mode`, you can reduce the testing time. For each
 mode, please see [here][mode].
 
-[mode]: https://rust-lang.github.io/rustc-guide/tests/adding.html#tests-that-do-not-result-in-compile-errors
+[mode]: ./adding.md#tests-that-do-not-result-in-compile-errors
 
 ## Using incremental compilation