user-manual.conf: don't specify [listingblock]

This is the config file we use when we build the user manual with
AsciiDoc. The comment at the top of this chunk that we're removing says
the following:

  "unbreak" docbook-xsl v1.68 for manpages (sic!). v1.69 works with or
  without this.

This comes from d19fbc3c17 ("Documentation: add git user's manual",
2007-01-07), where it looks like this conf file in general and this
snippet in particular was copy-pasted from asciidoc.conf.

This chunk is very similar to something we just got rid of for the
manpages, and because this appears to be aimed at v1.68 -- which we no
longer support for the manpages as of a few commits ago --, it's
tempting to get rid of this. That reveals an interesting aspect of
"works with or without this": it turns out it actually works /better/
without!

Dropping this makes us render code snippets and shell listings using
<screen> rather than <literallayout>, just like Asciidoctor does. In
user-manual.pdf, this puts the contents into dimmed-background,
easy-to-distinguish-from-the-surrounding-text boxes, as opposed to
white-background (transparent) boxes.

Signed-off-by: Martin Ågren <martin.agren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/user-manual.conf

@@ -9,13 +9,3 @@ tilde=~
 
 [linkgit-inlinemacro]
 <ulink url="{target}.html">{target}{0?({0})}</ulink>
-
-ifdef::backend-docbook[]
-# "unbreak" docbook-xsl v1.68 for manpages. v1.69 works with or without this.
-[listingblock]
-<example><title>{title}</title>
-<literallayout class="monospaced">
-|
-</literallayout>
-{title#}</example>
-endif::backend-docbook[]