link to htl github

Author: mbostock

docs/index.html

@@ -159,7 +159,7 @@
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     ### Modernized standard library
 
-    Notebooks 2.0 upgrades the built-ins available by default in notebooks. This includes upgrading core functions that aren't strictly backwards compatible, namely the `md`, `html`, and `tex` tagged template literals that power Markdown, HTML, and ${tex`\TeX`} cells. In Notebooks 2.0, these are now powered by the latest versions of [markdown-it](https://github.com/markdown-it/markdown-it), [Hypertext Literal](https://observablehq.com/@observablehq/htl), and [${tex`\KaTeX`}](https://katex.org/).
+    Notebooks 2.0 upgrades the built-ins available by default in notebooks. This includes upgrading core functions that aren't strictly backwards compatible, namely the `md`, `html`, and `tex` tagged template literals that power Markdown, HTML, and ${tex`\TeX`} cells. In Notebooks 2.0, these are now powered by the latest versions of [markdown-it](https://github.com/markdown-it/markdown-it), [Hypertext Literal](https://github.com/observablehq/htl), and [${tex`\KaTeX`}](https://katex.org/).
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   <script id="11" type="text/markdown">
     <aside>We still provide <code>require</code> as a built-in to improve backwards compatibility, but it’s simply a wrapper around dynamic <code class="language-js">import</code>.</aside>