Fix Google Cloud Secret Manager typo (#2196)

See [issue](https://github.com/external-secrets/external-secrets/issues/2195)

Signed-off-by: Matthias Baetens <baetensmatthias@gmail.com>

hack/api-docs/mkdocs.yml

@@ -83,7 +83,7 @@ nav:
     - AWS Secrets Manager: provider/aws-secrets-manager.md
     - AWS Parameter Store: provider/aws-parameter-store.md
     - Azure Key Vault: provider/azure-key-vault.md
-    - Google Secret Manager: provider/google-secrets-manager.md
+    - Google Cloud Secret Manager: provider/google-secrets-manager.md
     - IBM Secrets Manager: provider/ibm-secrets-manager.md
     - Akeyless: provider/akeyless.md
     - HashiCorp Vault: provider/hashicorp-vault.md