Add API documentations for "Service LB Policy" resource (#10984) (#7559)

[upstream:410d1238c3ed91917f80a1f15a94362999e0cf0a]

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/10984.txt

@@ -0,0 +1,2 @@
+```release-note:none
+```

website/docs/r/network_services_service_lb_policies.html.markdown

@@ -24,6 +24,9 @@ ServiceLbPolicy holds global load balancing and traffic distribution configurati
 ~> **Warning:** This resource is in beta, and should be used with the terraform-provider-google-beta provider.
 See [Provider Versions](https://terraform.io/docs/providers/google/guides/provider_versions.html) for more details on beta resources.
 
+To get more information about ServiceLbPolicies, see:
+
+* [API documentation](https://cloud.google.com/service-mesh/docs/reference/network-services/rest/v1/projects.locations.serviceLbPolicies)
 
 <div class = "oics-button" style="float: right; margin: 0 0 -15px">
   <a href="https://console.cloud.google.com/cloudshell/open?cloudshell_git_repo=https%3A%2F%2Fgithub.com%2Fterraform-google-modules%2Fdocs-examples.git&cloudshell_image=gcr.io%2Fcloudshell-images%2Fcloudshell%3Alatest&cloudshell_print=.%2Fmotd&cloudshell_tutorial=.%2Ftutorial.md&cloudshell_working_dir=network_services_service_lb_policies_basic&open_in_editor=main.tf" target="_blank">