changelog: fix 1.12.0-rc1, 1.11.4, 1.10.7, 1.9.10 (#17408)
changelog: fix 1.12.0-rc1, 1.11.4, 1.10.7, 1.9.10 (#17408)

* Update changelog with correct SHAs.
* Clean up some formatting.
hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault