Update the Vault documentation for ID tokens, access for Okta groups, and various fixes
Update the Vault documentation for:
- ID tokens (https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/22777)
- access for Okta groups (https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/17553)
- Vault token expiration workaround for Terraform (https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/17552)
- various small fixes