Merge pull request swiftlang#80565 from ziad-ashraf7/update-docs

[docs] Add the Ubuntu 24.04 Dockerfile link to the getting started guide

Author: AnthonyLatsis

docs/HowToGuides/GettingStarted.md

@@ -164,6 +164,7 @@ toolchain as a one-off, there are a couple of differences:
    * [Ubuntu 18.04](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/ubuntu/18.04/Dockerfile)
    * [Ubuntu 20.04](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/ubuntu/20.04/Dockerfile)
    * [Ubuntu 22.04](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/ubuntu/22.04/Dockerfile)
+   * [Ubuntu 24.04](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/ubuntu/24.04/Dockerfile)
    * [CentOS 7](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/centos/7/Dockerfile)
    * [Amazon Linux 2](https://github.com/swiftlang/swift-docker/blob/main/swift-ci/main/amazon-linux/2/Dockerfile)