Update requestHeadersAllowlist in openid-connect.md example settings (#…

…6783)

Update the example settings to ensure the `opensearch.requestHeadersAllowlist`  matches the multi-tenancy configuration documentation with `["securitytenant","Authorization"]`.

See [Multi-tenancy Configuration documentation](https://opensearch.org/docs/latest/security/multi-tenancy/multi-tenancy-config/)

Signed-off-by: Simple-Analysis <[email protected]>
Co-authored-by: Naarcha-AWS <[email protected]>
(cherry picked from commit fb90f57)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

_security/authentication-backends/openid-connect.md

@@ -348,7 +348,7 @@ opensearch.password: "kibanaserver"
 opensearch.ssl.verificationMode: none
 
 # allowlist basic headers and multi-tenancy header
-opensearch.requestHeadersAllowlist: ["Authorization", "security_tenant"]
+opensearch.requestHeadersAllowlist: ["Authorization", "securitytenant"]
 ```
 
 To include OpenID Connect with other authentication types in the Dashboards sign-in window, see [Configuring sign-in options]({{site.url}}{{site.baseurl}}/security/configuration/multi-auth/).