Docs: fix link and missing package

docs/docs/integrations/chat/maritalk.ipynb

@@ -4,13 +4,13 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "<a href=\"https://colab.research.google.com/github/langchain-ai/langchain/docs/docs/integrations/chat/maritalk.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>\n",
+    "<a href=\"https://colab.research.google.com/github/langchain-ai/langchain/blob/master/docs/docs/integrations/chat/maritalk.ipynb\" target=\"_parent\"><img src=\"https://colab.research.google.com/assets/colab-badge.svg\" alt=\"Open In Colab\"/></a>\n",
     "\n",
     "# Maritalk\n",
     "\n",
     "## Introduction\n",
     "\n",
-    "MariTalk is an assistant developed by the Brazilian company [Maritaca AI](www.maritaca.ai).\n",
+    "MariTalk is an assistant developed by the Brazilian company [Maritaca AI](https://www.maritaca.ai).\n",
     "MariTalk is based on language models that have been specially trained to understand Portuguese well.\n",
     "\n",
     "This notebook demonstrates how to use MariTalk with LangChain through two examples:\n",
@@ -33,7 +33,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "!pip install langchain-core langchain-community"
+    "!pip install langchain langchain-core langchain-community"
    ]
   },
   {