Fix Colab Button to Redirect to Colab (#490)

## Problem

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why?

## Solution

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or other resources.

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [ ] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

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Author: arjunpatel7

learn/generation/better-rag/02b-semantic-chunking.ipynb

@@ -13,7 +13,7 @@
       "cell_type": "markdown",
       "metadata": {},
       "source": [
-        "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://github.com/pinecone-io/examples/blob/master/learn/generation/better-rag/02b-semantic-chunking.ipynb)"
+        "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/pinecone-io/examples/blob/master/learn/generation/better-rag/02b-semantic-chunking.ipynb)"
       ]
     },
     {