Update JSON_mode_example.ipynb (microsoft#3130)

Improve minor mistakes in documentation

Author: umermansoor

notebook/JSON_mode_example.ipynb

@@ -26,7 +26,7 @@
     "\n",
     "\n",
     "## Requirements\n",
-    "JSON mode is a feature of OpenAI API, however strong models (such as claude 3 Opus), can generate appropriate json as well.\n",
+    "JSON mode is a feature of OpenAI API, however strong models (such as Claude 3 Opus), can generate appropriate json as well.\n",
     "AutoGen requires `Python>=3.8`. To run this notebook example, please install:\n",
     "```bash\n",
     "pip install pyautogen\n",
@@ -71,7 +71,7 @@
    "source": [
     "## Model Configuration\n",
     "\n",
-    "we Need to set two different Configs for this to work. \n",
+    "We need to set two different Configs for this to work. \n",
     "One for JSON mode\n",
     "One for Text mode. \n",
     "This is because the group chat manager requires text mode. "