Prerequisites

• I have searched for duplicate or closed feature requests
• I have read the contributing guidelines

Proposal

Need normalize copied examples:

1. Remove "doc" classes like as .bd-placeholder-img
2. Replace svg placeholders to images displaying svg file(<img src="/path/to/placeholder.svg" alt="">) like as:

<svg xmlns="http://www.w3.org/2000/svg">
<rect width="100%" height="100%" fill="#868e96"></rect>
<text x="50%" y="50%" text-anchor="middle" fill="#dee2e6">Image</text>
</svg>

Motivation and context

Get an example as close as possible to the real code.