docs: plainer living-example callout

Author: cablehead

www-next-gen/how-tos/render-readme-as-doc-site.md

@@ -51,13 +51,10 @@ let pages = ($readme | split row "\n## " | skip 1 | each {|s|
 Add a sidebar that lists the sections and you have navigation. The README stays
 the single source of truth; you just slice it.
 
-> **A living example.** You do not have to imagine the result, you are reading
-> inside it. The [Reference](/reference) section of this site is the http-nu
-> README run through exactly the code above: one page per `## ` heading, a
-> sidebar built from the slugs, a prev/next pager. Go open it and click between
-> sections, watch the URL become each slug, then come back here, the code will
-> read like a description of what you just used. That is the whole lesson: the
-> doc site and the README are the same thing.
+> **A living example.** The [Reference](/reference) section of this site is the
+> code above, running: the http-nu README, sliced one page per `## ` heading,
+> with a sidebar of slugs and a prev/next pager. Click through it, then come
+> back here, the code reads like a description of what you just used.
 
 ## Typography