Fixed hyperlink

Changed the hyperlink from the relative path to point to the python file in the repo

6-NLP/1-Introduction-to-NLP/README.md

@@ -133,7 +133,7 @@ Let's create the bot next. We'll start by defining some phrases.
     It was nice talking to you, goodbye!
     ```
 
-    One possible solution to the task is [here](solution/bot.py)
+    One possible solution to the task is [here](https://github.com/microsoft/ML-For-Beginners/blob/main/6-NLP/1-Introduction-to-NLP/solution/bot.py)
 
     ✅ Stop and consider