RFR: Removed blockquote formatting for code blocks.

[Jesper Wilhelmsson]

On Thu, 9 Jul 2020 09:37:10 GMT, Andreas Lundblad <github.com+5994243+aioobe at openjdk.org> wrote:

> Blockquotes were used to format code blocks. With proper styling for `<pre><code>` blocks this is no longer needed.

Looks good!

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Marked as reviewed by jwilhelm (Lead).

PR: https://git.openjdk.java.net/guide/pull/24