Update caching.md

[SimLif]

Add another example that does not require downloading data from the Internet.

📚 Context

In the caching example documents, one example needs to download data from GitHub, which can cause an error such as IncompleteRead: IncompleteRead... due to poor network connectivity. Therefore, I have added another example that does not require downloading data from the Internet.

🧠 Description of Changes

• I have added a snippet of Python code and its corresponding description.

Revised:

Current: pass

💥 Impact

Size:

• [ ] Small
• [x] Not small

🌐 References

• https://30days.streamlit.app/?challenge=Day24

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By submitting this pull request you agree that all contributions to this project are made under the Apache 2.0 license.