Fix <img> tag rendering as html instead of text

[akd-io]

The tag is currently not escaped and therefore rendered as html. By putting it inside a code-block we can make it render as code, so the reader is able to see it.

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[akd-io]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

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[devversion]

Nice catch. LGTM

[jelbourn]

LGTM

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