docs: added hello-vault-spring repo link to developer-qs.mdx. (#14928)

* Update developer-qs.mdx

docs: added link to Java / Spring Boot sample app repo in developer quick start.

* removed space.

* trigger ci
Co-authored-by: taoism4504 <loann@hashicorp.com>

website/content/docs/get-started/developer-qs.mdx

@@ -8,7 +8,7 @@ description: Learn how to store and retrieve your first secret.
 
 This quick start will explore how to use Vault client libraries inside your application code to store and retrieve your first secret value. Vault takes the security burden away from developers by providing a secure, centralized secret store for an application’s sensitive data: credentials, certificates, encryption keys, and more.
 
-For an out-of-the-box runnable demo application showcasing these concepts and more, see the hello-vault repositories ([Go](https://github.com/hashicorp/hello-vault-go), [C#](https://github.com/hashicorp/hello-vault-dotnet)).
+For an out-of-the-box runnable demo application showcasing these concepts and more, see the hello-vault repositories ([Go](https://github.com/hashicorp/hello-vault-go), [C#](https://github.com/hashicorp/hello-vault-dotnet) and [Java/Spring Boot](https://github.com/hashicorp/hello-vault-spring)).
 
 ## Prerequisites