Correct typo in /ci/secrets documentation

Replaced HashiCoupr with HashiCorp in
"Using external secrets in CI"

doc/ci/secrets/index.md

@@ -40,7 +40,7 @@ is summarized by this diagram:
 1. HashiCorp Vault verifies the JWT.
 1. HashiCorp Vault checks the bounded claims and attaches policies.
 1. HashiCorp Vault returns the token.
-1. Runner reads secrets from the HashiCoupr Vault.
+1. Runner reads secrets from the HashiCorp Vault.
 
 NOTE: **Note:**
 Read the [Authenticating and Reading Secrets With HashiCorp Vault](../examples/authenticating-with-hashicorp-vault/index.md)