src/vs/base/common/htmlContent.ts/MarkdownString/appendCodeblock
class MarkdownString:	appendCodeblock(langId: string, code: string): MarkdownString {
		this.value += '\n```';
		this.value += langId;
		this.value += '\n';
		this.value += code;
		this.value += '\n```\n';
		return this;
	}