docs: rm unnecessary imports (#16876)

- **Description:** optimize the document of memory usage
  - **Issue:** it lose some install guide

docs/docs/integrations/memory/aws_dynamodb.ipynb

@@ -274,8 +274,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Optional\n",
-    "\n",
     "from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\n",
     "from langchain_core.runnables.history import RunnableWithMessageHistory\n",
     "from langchain_openai import ChatOpenAI"

docs/docs/integrations/memory/mongodb_chat_message_history.ipynb

@@ -133,8 +133,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Optional\n",
-    "\n",
     "from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\n",
     "from langchain_core.runnables.history import RunnableWithMessageHistory\n",
     "from langchain_openai import ChatOpenAI"

docs/docs/integrations/memory/remembrall.md

@@ -16,6 +16,12 @@ To get started, [sign in with Github on the Remembrall platform](https://remembr
 
 Any request that you send with the modified `openai_api_base` (see below) and Remembrall API key will automatically be tracked in the Remembrall dashboard. You **never** have to share your OpenAI key with our platform and this information is **never** stored by the Remembrall systems.
 
+To do this, we need to install the following dependencies:
+
+```bash
+pip install -U langchain-openai
+```
+
 ### Enable Long Term Memory
 
 In addition to setting the `openai_api_base` and Remembrall API key via `x-gp-api-key`, you should specify a UID to maintain memory for. This will usually be a unique user identifier (like email).

docs/docs/integrations/memory/sql_chat_message_history.ipynb

@@ -26,7 +26,7 @@
     "The integration lives in the `langchain-community` package, so we need to install that. We also need to install the `SQLAlchemy` package.\n",
     "\n",
     "```bash\n",
-    "pip install -U langchain-community SQLAlchemy\n",
+    "pip install -U langchain-community SQLAlchemy langchain-openai\n",
     "```"
    ]
   },
@@ -71,10 +71,7 @@
      "end_time": "2023-08-28T10:04:38.077748Z",
      "start_time": "2023-08-28T10:04:36.105894Z"
     },
-    "collapsed": false,
-    "jupyter": {
-     "outputs_hidden": false
-    }
+    "collapsed": false
    },
    "outputs": [],
    "source": [
@@ -97,10 +94,7 @@
      "end_time": "2023-08-28T10:04:38.929396Z",
      "start_time": "2023-08-28T10:04:38.915727Z"
     },
-    "collapsed": false,
-    "jupyter": {
-     "outputs_hidden": false
-    }
+    "collapsed": false
    },
    "outputs": [
     {
@@ -137,8 +131,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Optional\n",
-    "\n",
     "from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\n",
     "from langchain_core.runnables.history import RunnableWithMessageHistory\n",
     "from langchain_openai import ChatOpenAI"

docs/docs/integrations/memory/sqlite.ipynb

@@ -119,8 +119,6 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "from typing import Optional\n",
-    "\n",
     "from langchain_core.prompts import ChatPromptTemplate, MessagesPlaceholder\n",
     "from langchain_core.runnables.history import RunnableWithMessageHistory\n",
     "from langchain_openai import ChatOpenAI"