[rustdoc] Add `no-hidden-lines` codeblock attribute#118711

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GuillaumeGomez wants to merge 3 commits intorust-lang:masterfrom

GuillaumeGomez:raw-codeblock-attribute

Commits on Dec 8, 2023

Add `no-hidden-lines` codeblock attribute to prevent removing lines or extra `#` characters
GuillaumeGomez
committed

Commits on Dec 10, 2023

Add tests for `no-hidden-lines` codeblock attribute
GuillaumeGomez
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Add documentation for `no-hidden-lines` codeblock attribute
GuillaumeGomez
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