add service-to-service checks external link (#26725)

Author: maxvp

src/content/docs/cloudflare-one/reusable-components/posture-checks/access-integrations.mdx

@@ -2,14 +2,14 @@
 pcx_content_type: navigation
 title: Access integrations
 sidebar:
-  order: 4
+  order: 3
 ---
 
 The following device posture checks do not require the WARP client and can only be used in [Cloudflare Access policies](/cloudflare-one/access-controls/policies/). They cannot be used in Gateway network policies.
 
 ## Supported operating systems
 
 | Device posture check                                                                            | macOS | Windows | Linux | iOS | Android/ChromeOS |
-| ----------------------------------------------------------------------------------------------- | ----- | ------- | ----- | --- |---------------------------------------------------------------------------------------- |
+| ----------------------------------------------------------------------------------------------- | ----- | ------- | ----- | --- | ---------------- |
 | [Microsoft Entra ID Conditional Access](/cloudflare-one/tutorials/entra-id-conditional-access/) | ✅    | ✅      | ❌    | ❌  | ❌               |
-| [Mutual TLS](/cloudflare-one/access-controls/service-credentials/mutual-tls-authentication/)   | ✅    | ✅      | ✅    | ✅  | ✅               |
+| [Mutual TLS](/cloudflare-one/access-controls/service-credentials/mutual-tls-authentication/)    | ✅    | ✅      | ✅    | ✅  | ✅               |

src/content/docs/cloudflare-one/reusable-components/posture-checks/service-to-service.mdx

@@ -0,0 +1,7 @@
+---
+pcx_content_type: navigation
+title: Service-to-service checks
+external_link: /cloudflare-one/integrations/service-providers/
+sidebar:
+  order: 2
+---