docs: added hello-vault-spring repo link to developer-qs.mdx. (#14928)
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 <ed7067a8e93190f0b581d3c64a2a8cc3fd8d2722@hashicorp.com>
hashicorp/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault