Incorrect hyperlink in readme for Azure SQL Database load testing

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### This issue is for a: (mark with an `x`)
```
- [ ] bug report -> please search issues before submitting
- [ ] feature request
- [x] documentation issue or request
- [ ] regression (a behavior that used to work and stopped in a new release)
```
The README.md contains the following text:

_You can find more information about this sample and instructions for how to use in the [following blog post](https://github.com/Azure-Samples/azure-load-testing-samples/blob/main/jmeter-azure-services/azure-sql-database)._

However, the hyperlink for the text `following blog post` just links to the repo/folder containing the README.md

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