chore: auto-fix Markdownlint issues

CONTRIBUTING.md

@@ -223,7 +223,7 @@ To ensure that all MDN documents follow the same formatting, we use both [Pretti
 
 If you have a [local checkout](#forking-and-cloning-the-repository) of the repository and have [installed the dependencies](#preparing-the-project), or you are using [github.dev](https://github.dev), a pre-commit hook will be installed which automatically runs while making a commit. To save some headache and improve your work flow while authoring, you may wish to [configure your editor to automatically run Prettier](https://prettier.io/docs/en/editors.html). Alternatively, you may run `yarn fix:md` in the command line to manually format all Markdown files.
 
-> **Note:** Automatically formatting changes does not work for pull requests opened using the GitHub Web UI as described in the ["Simple changes" section](#simple-changes). This may result in failed status checks on pull requests. If you're not sure about how to fix this, [get in touch with us](https://developer.mozilla.org/en-US/docs/MDN/Community/Communication_channels) for help.
+> **Note:** Automatically formatting changes does not work for pull requests opened using the GitHub Web UI as described in the ["Simple changes" section](#simple-changes). This may result in failed status checks on pull requests. If you're not sure about how to fix this, [get in touch with us](/en-US/docs/MDN/Community/Communication_channels) for help.
 
 ### Adding a new document
 

files/en-us/learn/server-side/express_nodejs/forms/create_genre_form/index.md

@@ -130,7 +130,7 @@ asyncHandler(async (req, res, next) => {
 ```
 
 If the genre name data is valid then we perform a case-insensitive search to see if a `Genre` with the same name already exists (as we don't want to create duplicate or near duplicate records that vary only in letter case, such as: "Fantasy", "fantasy", "FaNtAsY", and so on).
-To ignore letter case and accents when searching we chain the [`collation()`](https://mongoosejs.com/docs/api/query.html#Query.prototype.collation()) method, specifying the locale of 'en' and strength of 2 (for more information see the MongoDb [Collation](https://www.mongodb.com/docs/manual/reference/collation/) topic).
+To ignore letter case and accents when searching we chain the [`collation()`](<https://mongoosejs.com/docs/api/query.html#Query.prototype.collation()>) method, specifying the locale of 'en' and strength of 2 (for more information see the MongoDb [Collation](https://www.mongodb.com/docs/manual/reference/collation/) topic).
 
 If a `Genre` with a matching name already exists we redirect to its detail page.
 If not, we save the new `Genre` and redirect to its detail page.