PackageJson: Prettify markdown/mdx on commit with lint-staged (#37616)

* Format md,mdx files with prettier on lint-staged

* Manually run prettier on docs/sources

docs/sources/whatsnew/whats-new-in-v4-1.md

@@ -9,6 +9,7 @@ list = false
 +++
 
 ## What's new in Grafana v4.1
+
 - **Graph**: Support for shared tooltip on all graphs as you hover over one graph. [#1578](https://github.com/grafana/grafana/pull/1578), [#6274](https://github.com/grafana/grafana/pull/6274)
 - **Victorops**: Add VictorOps notification integration [#6411](https://github.com/grafana/grafana/issues/6411), thx [@ichekrygin](https://github.com/ichekrygin)
 - **Opsgenie**: Add OpsGenie notification integratiion [#6687](https://github.com/grafana/grafana/issues/6687), thx [@kylemcc](https://github.com/kylemcc)
@@ -37,6 +38,7 @@ You can set a help text in the general tab on any panel. The help text is using
 {{< figure class="float-right"  max-width="60%" src="/static/img/docs/v41/helptext_hover.png" caption="Hovering help text" >}}
 
 Panels with a help text available have a little indicator in the top left corner. You can show the help text by hovering the icon.
+
 <div class="clearfix"></div>
 
 ### Easier Cloudwatch configuration
@@ -47,6 +49,7 @@ In Grafana 4.1.0 you can configure your Cloudwatch data source with `access key`
 This enables people to use the Cloudwatch data source without having access to the filesystem where Grafana is running.
 
 Once the `access key` and `secret key` have been saved the user will no longer be able to view them.
+
 <div class="clearfix"></div>
 
 ## Upgrade and Breaking changes
@@ -63,4 +66,5 @@ of new features, changes, and bug fixes.
 Head to [v4.1 download page](/download/4_1_0/) for download links and instructions.
 
 ## Thanks
+
 A big thanks to all the Grafana users who contribute by submitting PRs, bug reports and feedback!