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Moved `hljs` class to `<code>` from `<pre>`. (#913)

In this change set I am changing the guidance in the README
and in comments to put the class on the correct tag: `<code>`, not `<pre>`.

If you put the `hljs` class on `<pre>`, syntax highlighting
does not use the correct padding.

You can see from the default CSS stylesheet in the highlight.js
repo that the `hljs` tag is expected to be on the `<code>` tag:
https://github.com/highlightjs/highlight.js/blob/84719c17a/src/styles/default.css#L17-L25

All the official highlight.js examples have the `hljs` class on `<code>`:
https://highlightjs.org/static/demo/

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