Corrected Grammatical errors in tutorials.mdx (#9358)

I want to extend my heartfelt gratitude to the creator for masterfully
crafting this remarkable application. 🙌 I am truly impressed by the
meticulous attention to grammar and spelling in the documentation, which
undoubtedly contributes to a polished and seamless reader experience.

As always, your feedback holds immense value and is greatly appreciated.

@baskaryan , @hwchase17

docs/extras/additional_resources/tutorials.mdx

@@ -85,7 +85,7 @@ Below are links to video tutorials and courses on LangChain. For written guides
 - [`BabyAGI`: Discover the Power of Task-Driven Autonomous Agents!](https://youtu.be/QBcDLSE2ERA)
 - [Improve your `BabyAGI` with LangChain](https://youtu.be/DRgPyOXZ-oE)
 - [Master `PDF` Chat with LangChain - Your essential guide to queries on documents](https://youtu.be/ZzgUqFtxgXI)
-- [Using LangChain with `DuckDuckGO` `Wikipedia` & `PythonREPL` Tools](https://youtu.be/KerHlb8nuVc)
+- [Using LangChain with `DuckDuckGO`, `Wikipedia` & `PythonREPL` Tools](https://youtu.be/KerHlb8nuVc)
 - [Building Custom Tools and Agents with LangChain (gpt-3.5-turbo)](https://youtu.be/biS8G8x8DdA)
 - [LangChain Retrieval QA Over Multiple Files with `ChromaDB`](https://youtu.be/3yPBVii7Ct0)
 - [LangChain Retrieval QA with Instructor Embeddings & `ChromaDB` for PDFs](https://youtu.be/cFCGUjc33aU)