Code Highlighting Incorrect

[WalkerCodeRanger]

Some code samples are missing class="lang-rust" and so Hilight.js is incorrectly guessing at the language.

For example:

rust-three-days-course/presentation/chapters/en-US/advanced-generics-bounds.chapter

Lines 16 to 18 in 07820df

	Example: `println("{:?}")` requires Debug
	<pre><code data-source="chapters/shared/code/advanced-generics-bounds/1.rs" data-trim="hljs rust"></code></pre>