zulip/static/templates/markdown_help.hbs

<div class="overlay-modal hide" id="message-formatting" tabindex="-1" role="dialog"
  aria-label="{{t 'Message formatting' }}">
    <div class="modal-body" data-simplebar data-simplebar-auto-hide="false">
        <div id="markdown-instructions">
            <table class="table table-striped table-condensed table-rounded table-bordered help-table">
                <thead>
                    <tr>
                        <th>{{t "You type" }}</th>
                        <th>{{t "You get" }}</th>
                    </tr>
                </thead>

                <tbody>
                    {{#each markdown_help_rows}}
                        <tr>
                            {{#if note_html}}
                            <td colspan="2">{{{note_html}}}</td>
                            {{else}}
                            <td><div class="preserve_spaces">{{markdown}}</div> {{{usage_html}}}</td>
                            <td class="rendered_markdown">{{{output_html}}} {{{effect_html}}}</td>
                            {{/if}}
                        </tr>
                    {{/each}}
                </tbody>
            </table>
        </div>
        <hr />
        <a href="/help/format-your-message-using-markdown" target="_blank" rel="noopener noreferrer">{{t "Detailed message formatting documentation" }}</a>
    </div>
</div>