Improve readability in agentchat_groupchat_research.ipynb (#350)

* Improve readability in agentchat_groupchat_research.ipynb

* Undo updates to system message.

notebook/agentchat_groupchat_research.ipynb

@@ -15,7 +15,7 @@
    "source": [
     "# Auto Generated Agent Chat: Performs Research with Multi-Agent Group Chat\n",
     "\n",
-    "AutoGen offers conversable agents powered by LLM, tool or human, which can be used to perform tasks collectively via automated chat. This framework allows tool use and human participation through multi-agent conversation.\n",
+    "AutoGen offers conversable agents powered by LLM, tool, or human, which can be used to perform tasks collectively via automated chat. This framework allows tool use and human participation through multi-agent conversation.\n",
     "Please find documentation about this feature [here](https://microsoft.github.io/autogen/docs/Use-Cases/agent_chat).\n",
     "\n",
     "## Requirements\n",
@@ -93,7 +93,7 @@
     "]\n",
     "```\n",
     "\n",
-    "If you open this notebook in colab, you can upload your files by clicking the file icon on the left panel and then choose \"upload file\" icon.\n",
+    "If you open this notebook in colab, you can upload your files by clicking the file icon on the left panel and then choosing \"upload file\" icon.\n",
     "\n",
     "You can set the value of config_list in other ways you prefer, e.g., loading from a YAML file."
    ]