rustdoc: Move the extra labels to the symbol in tables

[dns2utf8]

Currently labels like Deprecated are in the right column far away from the symbol they describe:

I propose we move them to the symbol in the left column.

Cheers,
Stefan

From #85651

[GuillaumeGomez]

Do you want to be assigned on it?

[dns2utf8]

Yes, please 👍

[GuillaumeGomez]

Done. :)

[dns2utf8]

Thanks! :)

[dns2utf8]

I uploaded a demo for the PR: https://data.estada.ch/rustdoc-nightly_2336406b38_2021-06-24/rustdoc_demo/mod1/index.html

[dns2utf8]

Implemented with #86594, potentially improved by #86767

[jyn514]

Closing this since it was implemented.