Update delete.mdx (#13148)
Update delete.mdx (#13148)

Adding a note on the parameter necessary for deletion on a key deletion example seems like a good idea.
From my limited research I found other people that had trouble finding the relevant part of the documentation.
Though I'm not sure this is the best wording or formatting for it.
rnaveiras/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault