Rollup merge of #65613 - Mark-Simulacrum:rustdoc-preserve-ws, r=GuillaumeGomez
Rollup merge of #65613 - Mark-Simulacrum:rustdoc-preserve-ws, r=GuillaumeGomez

Preserve whitespace inside one-backtick codeblocks

Previously this was only done inside short docblocks (e.g., summary
lines), but we should also do so in general.

Fixes #65555

aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust