rustdoc: use CSS inline layout for radio line instead of flexbox
This uses less code to lay them out the same way. Already tested here:
5ce39f42bd/tests/rustdoc-gui/settings.goml (L123)
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- The bootstrapping build system
- Various submodules for tools, like cargo, tidy, etc.
For more information on how various parts of the compiler work, see the rustc dev guide.