Docs: updated developer guide (#29978)

* Docs: updated developer guide

* Fix: made heading uppercase

* small nit fix

contribute/developer-guide.md

@@ -25,6 +25,10 @@ brew install node@14
 npm install -g yarn
 ```
 
+### Windows
+
+If you are running Grafana on Windows 10, we recommend installing the Windows Subsystem for Linux (WSL). For installation instructions, refer to the [Microsoft WSL Installation Guide](https://docs.microsoft.com/en-us/windows/wsl/install-win10).
+
 ## Download Grafana
 
 We recommend using the Git command-line interface to download the source code for the Grafana project:
@@ -102,6 +106,7 @@ go test -v ./pkg/...
 ```
 
 #### On Windows
+
 Running the backend tests on Windows currently needs some tweaking, so use the build.go script:
 
 ```