Update `PromptLayerOpenAI` LLM usage instructions in documentation (#1053)

This PR updates the usage instructions for PromptLayerOpenAI in
Langchain's documentation. The updated instructions provide more detail
and conform better to the style of other LLM integration documentation
pages.

No code changes were made in this PR, only improvements to the
documentation. This update will make it easier for users to understand
how to use `PromptLayerOpenAI`

docs/modules/llms/integrations/promptlayer_openai.ipynb

@@ -11,6 +11,82 @@
     "This example showcases how to connect to [PromptLayer](https://www.promptlayer.com) to start recording your OpenAI requests."
    ]
   },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "id": "6a45943e",
+   "metadata": {},
+   "source": [
+    "## Install PromptLayer\n",
+    "The `promptlayer` package is required to use PromptLayer with OpenAI. Install `promptlayer` using pip."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "dbe09bd8",
+   "metadata": {
+    "vscode": {
+     "languageId": "powershell"
+    }
+   },
+   "outputs": [],
+   "source": [
+    "pip install promptlayer"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "536c1dfa",
+   "metadata": {},
+   "source": [
+    "## Imports"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "c16da3b5",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "import os\n",
+    "from langchain.llms import PromptLayerOpenAI\n",
+    "import promptlayer"
+   ]
+  },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "id": "8564ce7d",
+   "metadata": {},
+   "source": [
+    "## Set the Environment API Key\n",
+    "You can create a PromptLayer API Key at [wwww.promptlayer.com](https://ww.promptlayer.com) by clicking the settings cog in the navbar.\n",
+    "\n",
+    "Set it as an environment variable called `PROMPTLAYER_API_KEY`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "46ba25dc",
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "os.environ[\"PROMPTLAYER_API_KEY\"] = \"********\""
+   ]
+  },
+  {
+   "attachments": {},
+   "cell_type": "markdown",
+   "id": "bf0294de",
+   "metadata": {},
+   "source": [
+    "## Use the PromptLayerOpenAI LLM like normal\n",
+    "*You can optionally pass in `pl_tags` to track your requests with PromptLayer's tagging feature.*"
+   ]
+  },
   {
    "cell_type": "code",
    "execution_count": 4,
@@ -29,26 +105,23 @@
     }
    ],
    "source": [
-    "from langchain.llms import PromptLayerOpenAI\n",
-    "import promptlayer\n",
-    "import os\n",
-    "\n",
-    "# Set up API keys, you can get a promptlayer api key here: https://promptlayer.com/\n",
-    "os.environ[\"OPENAI_API_KEY\"] = \"YOUR_OPENAI_API_KEY\"\n",
-    "promptlayer.api_key = \"YOUR_PROMPTLAYER_API_KEY\"\n",
-    "\n",
-    "# Optionally pass in pl_tags to track your requests\n",
     "llm = PromptLayerOpenAI(pl_tags=[\"langchain\"])\n",
-    "\n",
     "llm(\"I am a cat and I want\")"
    ]
   },
   {
-   "cell_type": "code",
-   "execution_count": null,
-   "id": "ae4559c7",
+   "attachments": {},
+   "cell_type": "markdown",
+   "id": "a2d76826",
+   "metadata": {},
+   "source": [
+    "**The above request should now appear on your [PromptLayer dashboard](https://ww.promptlayer.com).**"
+   ]
+  },
+  {
+   "cell_type": "markdown",
+   "id": "05e9e2fe",
    "metadata": {},
-   "outputs": [],
    "source": []
   }
  ],
@@ -68,7 +141,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.8.8"
+   "version": "3.8.8 (default, Apr 13 2021, 12:59:45) \n[Clang 10.0.0 ]"
   },
   "vscode": {
    "interpreter": {