src/vs/base/common/htmlContent.ts/MarkdownString/appendLink
class MarkdownString:	appendLink(target: URI | string, label: string, title?: string): MarkdownString {
		this.value += '[';
		this.value += this._escape(label, ']');
		this.value += '](';
		this.value += this._escape(String(target), ')');
		if (title) {
			this.value += ` "${this._escape(this._escape(title, '"'), ')')}"`;
		}
		this.value += ')';
		return this;
	}