docs: fix URL for plugin portal mdx page (#9885)
docs: fix URL for plugin portal mdx page (#9885)


hashicorp/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hartsock/vault,hartsock/vault,hartsock/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hartsock/vault,hartsock/vault,hashicorp/vault,hashicorp/vault