nixos/make-options-doc: make whitespace more md-compatible

markdown-it-py creates different whitespace leaders/trailers than are
currently emitted, and when we convert examples and defaults to render
via markdown the spacing will change too. this has no effect on rendered
output.

nixos/lib/make-options-doc/mergeJSON.py

@@ -73,7 +73,7 @@ class Renderer(mistune.renderers.BaseRenderer):
         return f"<literal>{escape(text)}</literal>"
     def block_code(self, text, info=None):
         info = f" language={quoteattr(info)}" if info is not None else ""
-        return f"<programlisting{info}>\n{escape(text)}</programlisting>"
+        return f"<programlisting{info}>{escape(text)}</programlisting>"
     def link(self, link, text=None, title=None):
         tag = "link"
         if link[0:1] == '#':