Github moved the branch actions docs location

CONTRIBUTING.md

@@ -15,7 +15,7 @@ If you want to add an entry to the `README.md` please consider this:
     * if you've not published your crate to `crates.io` remove the `[[CRATE](...)]` part.
     * if you have a CI build, please add the build badge. Put the image after the description, separated by a space. Please make sure to add the branch information to the image:
        * example for Travis: ` [<img src="https://api.travis-ci.org/XXX/CRATE.svg?branch=master">](https://travis-ci.org/XXX/CRATE)`
-       * for Github actions please see https://docs.github.com/en/actions/configuring-and-managing-workflows/configuring-a-workflow#example-using-the-branch-parameter
+       * for Github actions please see https://docs.github.com/en/free-pro-team@latest/actions/managing-workflow-runs/adding-a-workflow-status-badge#using-the-branch-parameter
 - please pay attention to the alphabetical ordering.