docext 0.0.3

docext
Documentation 
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#### Modules, functions, and type aliases

Add the following at the end of the module doc comment, if there is one:

```html
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css" integrity="sha384-GvrOXuhMATgEsSwCs4smul74iXGOixntILdUW9XmUC6+HX0sLNAK3q71HotJqlAn" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.js" integrity="sha384-cpW21h6RZv/phavutF+AuVYrr+dA8xD9zs6FwLpaCct6O9ctzYFfFr4dgmgccOTx" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/contrib/auto-render.min.js" integrity="sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05" crossorigin="anonymous"></script>
<script>
renderMathInElement(document.body);
</script>
```

This ensures that the module doc, function doc, or type alias doc renders TeX correctly, but nothing
else renders TeX. This is because, for example, the items of the module shouldn't render TeX, since is looks weird.

#### Structs, traits (and their items), and impls (and their items)

For these items, multiple doc comments can be shown on the same page. Ensure that the renderMathInElement
call is only made once. Also, since the scripts will be inlined, they can (likely) all be under that if
statement.

Add the following to each doc comment, if it is present:

```html
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.css" integrity="sha384-GvrOXuhMATgEsSwCs4smul74iXGOixntILdUW9XmUC6+HX0sLNAK3q71HotJqlAn" crossorigin="anonymous">
<script src="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/katex.min.js" integrity="sha384-cpW21h6RZv/phavutF+AuVYrr+dA8xD9zs6FwLpaCct6O9ctzYFfFr4dgmgccOTx" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/katex@0.16.8/dist/contrib/auto-render.min.js" integrity="sha384-+VBxd3r6XgURycqtZ117nYw44OOcIax56Z4dCRWbxyPt0Koah1uHoK0o4+/RRE05" crossorigin="anonymous"></script>
<script>
var docExtTexSupport;
if (!docExtTexSupport) {
    docExtTexSupport = true;
    document.addEventListener("DOMContentLoaded", function() {
       renderMathInElement(document.body);
    });
}
</script>
```