Merge pull request #75742 from shibayan/patch-2

Update authentication-custom.md

Author: ktoliver

articles/static-web-apps/authentication-custom.md

@@ -219,7 +219,7 @@ Once you have the registration credentials, use the following steps to create a
              "registration": {
                "clientIdSettingName": "<MY_PROVIDER_CLIENT_ID_SETTING_NAME>",
                "clientCredential": {
-                 "secretSettingName": "<MY_PROVIDER_CLIENT_SECRET_SETTING_NAME>"
+                 "clientSecretSettingName": "<MY_PROVIDER_CLIENT_SECRET_SETTING_NAME>"
                },
                "openIdConnectConfiguration": {
                  "wellKnownOpenIdConfiguration": "https://<PROVIDER_ISSUER_URL>/.well-known/openid-configuration"