Fixes hyperlink in CHANGELOG.md
These libraries have gone through code quality checks including verification that no function has a [GNU Complexity](https://www.gnu.org/software/complexity/manual/complexity.html) score greater than 8, checks against deviations from the mandatory rules in the [MISRA coding standard](https://www.misra.org.uk), static code analysis from [Coverity static analysis](https://scan.coverity.com/) and validation of memory safety through the [CBMC automated reasoning tool](http://www.cs.cmu.edu/~modelcheck/cbmc/).
- [#1692](https://github.com/aws/aws-iot-device-sdk-embedded-C/pull/1692) Update the existing HTTP S3 download demo to obtain temporary credentials from [AWS IoT Credential Provider](https://docs.aws.amazon.com/iot/latest/developerguide/authorizing-direct-aws.html) and use the the new **AWS SigV4 library** to sign HTTP requests with those credentials for authenticating with AWS S3 service.
- [#1688](https://github.com/aws/aws-iot-device-sdk-embedded-C/pull/1688) Add Demo to showcase use of **AWS IoT Fleet Provisioning** library using the ["Provisioning by Claim"](https://docs.aws.amazon.com/iot/latest/developerguide/provision-wo-cert.html#claim-based) workflow of the Fleet Provisioning feature of AWS IoT Core.
-- [#1680](https://github.com/aws/aws-iot-device-sdk-embedded-C/pull/1670) Add new transport interface implementation using **Mbed TLS** (for TLS stack) and **corePKCS11** (for credential management).
+- [#1680](https://github.com/aws/aws-iot-device-sdk-embedded-C/pull/1680) Add new transport interface implementation using **Mbed TLS** (for TLS stack) and **corePKCS11** (for credential management).
### Minor Changes
