Docs: Update Rag tutorial so it includes an additional notebook cell with pip installs of required langchain_chroma and langchain_community. (#23204)

Description: Update Rag tutorial notebook so it includes an additional
notebook cell with pip installs of required langchain_chroma and
langchain_community.

This fixes the issue with the rag tutorial gives you a 'missing modules'
error if you run code in the notebook as is.

---------

Co-authored-by: Chester Curme <chester.curme@gmail.com>

docs/docs/tutorials/rag.ipynb

@@ -62,7 +62,7 @@
     "\n",
     "### Installation\n",
     "\n",
-    "To install LangChain run:\n",
+    "This tutorial requires these langchain dependencies:\n",
     "\n",
     "```{=mdx}\n",
     "import Tabs from '@theme/Tabs';\n",
@@ -71,10 +71,10 @@
     "\n",
     "<Tabs>\n",
     "  <TabItem value=\"pip\" label=\"Pip\" default>\n",
-    "    <CodeBlock language=\"bash\">pip install langchain</CodeBlock>\n",
+    "    <CodeBlock language=\"bash\">pip install langchain langchain_community langchain_chroma</CodeBlock>\n",
     "  </TabItem>\n",
     "  <TabItem value=\"conda\" label=\"Conda\">\n",
-    "    <CodeBlock language=\"bash\">conda install langchain -c conda-forge</CodeBlock>\n",
+    "    <CodeBlock language=\"bash\">conda install langchain langchain_community langchain_chroma -c conda-forge</CodeBlock>\n",
     "  </TabItem>\n",
     "</Tabs>\n",
     "\n",
@@ -124,7 +124,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
+   "execution_count": null,
    "id": "26ef9d35",
    "metadata": {},
    "outputs": [],
@@ -956,7 +956,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.4"
+   "version": "3.10.4"
   }
  },
  "nbformat": 4,