Merge pull request runatlantis#1185 from runatlantis/website

Fix broken link

runatlantis.io/docs/provider-credentials.md

@@ -14,7 +14,7 @@ It's up to you how you provide credentials for your specific provider to Atlanti
     * [GCE Instance Service Accounts](https://www.terraform.io/docs/providers/google/provider_reference.html#configuration-reference)
 * Many users set environment variables, ex. `AWS_ACCESS_KEY`, where Atlantis is running.
 * Others create the necessary config files, ex. `~/.aws/credentials`, where Atlantis is running.
-* Use the [HashiCorp Vault Provider](https://www.terraform.io/docs/providers/vault/index.html#using-vault-credentials-in-terraform-configuration)
+* Use the [HashiCorp Vault Provider](https://registry.terraform.io/providers/hashicorp/vault/latest/docs)
   to obtain provider credentials.
 
 :::tip