Improve documentation

docs/how-to-guides/scraping.ipynb

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+{
+ "cells": [
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import httpx\n",
+    "\n",
+    "transport = httpx.AsyncHTTPTransport(retries=2)\n",
+    "limits = httpx.Limits(max_connections=None)\n",
+    "timeout = httpx.Timeout(connect=60.0, read=300, write=60, pool=None)\n",
+    "async with httpx.AsyncClient(\n",
+    "    transport=transport, limits=limits, timeout=timeout\n",
+    ") as client:\n",
+    "    pass"
+   ]
+  }
+ ],
+ "metadata": {
+  "language_info": {
+   "name": "python"
+  },
+  "orig_nbformat": 4
+ },
+ "nbformat": 4,
+ "nbformat_minor": 2
+}