Update docs

docs/resources/user_environment_assignment.md

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+---
+# generated by https://github.com/hashicorp/terraform-plugin-docs
+page_title: "env0_user_environment_assignment Resource - terraform-provider-env0"
+subcategory: ""
+description: |-
+  
+---
+
+# env0_user_environment_assignment (Resource)
+
+
+
+## Example Usage
+
+```terraform
+data "env0_template" "template" {
+  name = "Template Name"
+}
+
+data "env0_project" "project" {
+  name = "Default Organization Project"
+}
+
+resource "env0_environment" "environment" {
+  name        = "environment"
+  project_id  = data.env0_project.project.id
+  template_id = data.env0_template.template.id
+}
+
+resource "env0_api_key" "api_key" {
+  name              = "user-api-key-sample"
+  organization_role = "User"
+}
+
+resource "env0_custom_role" "custom_role" {
+  name = "custom-role-sample"
+  permissions = [
+    "VIEW_PROJECT",
+    "EDIT_PROJECT_SETTINGS"
+  ]
+}
+
+resource "env0_user_environment_assignment" "assignment" {
+  user_id        = env0_api_key.api_key.id
+  environment_id = env0_environment.environment.id
+  role_id        = env0_custom_role.custom_role.id
+}
+```
+
+<!-- schema generated by tfplugindocs -->
+## Schema
+
+### Required
+
+- `environment_id` (String) id of the environment
+- `role_id` (String) id of the assigned role
+- `user_id` (String) id of the user
+
+### Read-Only
+
+- `id` (String) The ID of this resource.
+
+