Rollup merge of #106273 - notriddle:notriddle/source-content-overflow, r=GuillaumeGomez

rustdoc: remove redundant CSS `.source .content { overflow: visible }`

When added in 7669f04fb0ddc3d71a1fb44dc1c5c00a6564ae99 / #16066, the page itself was set to scroll. Now it's set so that the `example-wrap` is scrolling inside the page, so the overflow setting for the content is irrelevant.

diff --cc src/librustdoc/html/static/css/rustdoc.css
Simple merge