Link to C++ image example is outdated

[dungahk]

The link on this page https://containers.dev/implementors/json_reference/#remoteUser to the C++ image is outdated, it's pointing at line 26 but should be line 34.

Current: https://github.com/devcontainers/images/blob/main/src/cpp/.devcontainer/devcontainer.json#L26

Correct: https://github.com/devcontainers/images/blob/main/src/cpp/.devcontainer/devcontainer.json#L34

[bamurtaugh]

Thanks for filing this! If you get a chance, could you open a PR(s) (both to this repo, and in https://github.com/devcontainers/devcontainers.github.io for containers.dev)? That'd be a big help. Thank you!