Adding Docs for Datasource google_gke_hub_membership_binding (#15903)

Author: NA2047

mmv1/third_party/terraform/website/docs/d/gke_hub_membership_binding.html.markdown

@@ -0,0 +1,40 @@
+---
+subcategory: "GKEHub"
+description: |-
+  Retrieves the details of a GKE Hub Membership Binding.
+---
+
+# `google_gke_hub_membership_binding`
+
+Retrieves the details of a specific GKE Hub Membership Binding. Use this data source to retrieve the membership binding's configuration and state.
+
+A membership binding associates a GKE Hub membership with a scope, enabling the membership to participate in fleet-wide configurations and policies defined by the scope.
+
+## Example Usage
+
+```
+data "google_gke_hub_membership_binding" "example" {
+  location              = "global"
+  membership_id         = "my-membership-id"
+  membership_binding_id = "my-membership-binding-id"
+  project               = "my-project-id"
+}
+```
+
+## Argument Reference
+
+The following arguments are supported:
+
+* `membership_binding_id` - (Required) The ID of the membership binding.
+
+* `membership_id` - (Required) The ID of the membership that this binding applies to.
+
+* `location` - (Required) The location for the GKE Hub Membership Binding.
+    Currently only `global` is supported.
+
+* `project` - (Optional) The ID of the project in which the resource belongs.
+    If it is not provided, the provider project is used.
+
+## Attributes Reference
+
+See [google_gke_hub_membership_binding](https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/gke_hub_membership_binding) resource for details of the available attributes.