Update the text for server selection

re #509

database/migrations/2021_03_07_121716_update_speedtest_server_settings_text.php

@@ -0,0 +1,37 @@
+<?php
+
+use App\Setting;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+class UpdateSpeedtestServerSettingsText extends Migration
+{
+    private Setting $setting;
+
+    public function __construct()
+    {
+        $this->setting = Setting::where('name', 'server')->first();
+    }
+    /**
+     * Run the migrations.
+     *
+     * @return void
+     */
+    public function up()
+    {
+        $this->setting->description = '<p class="d-inline">Comma-separated list of speedtest.net server IDs picked randomly. Leave blank to use default settings.</p>;';
+        $this->setting->save();
+    }
+
+    /**
+     * Reverse the migrations.
+     *
+     * @return void
+     */
+    public function down()
+    {
+        $this->setting->description = '<p class="d-inline">Comma-separated list of speedtest.net servers picked randomly. Leave blank to use default settings.</p>';
+        $this->setting->save();
+    }
+}