[bug#65479] [PATCH core-updates 12/61] search-paths: Add $XML_CATALOG_FILES and $SGML_CATALOG_FILES.

[Maxim Cournoyer]

Bruno Victal <mirai@makinata.eu> writes:

> These variables are used by some packages for XML/SGML catalog lookups.
>
> * guix/search-paths ($XML_CATALOG_FILES, $SGML_CATALOG_FILES): New variable,
> extracted from …
> * gnu/packages/xml.scm (libxml2, opensp)[native-search-paths]: … here. Refer
> to the variables from (guix search-paths) respectively.
> * gnu/packages/perl.scm (perl-app-xml-docbook-builder)[native-search-paths]:
> Use $XML_CATALOG_FILES.
> * doc/guix.texi (Search Paths): Update documentation to reflect changes.

Nitpick: lonely colon (:) at the end of line.  It'd be more pleasant to
read as:

--8<---------------cut here---------------start------------->8---
* gnu/packages/perl.scm (perl-app-xml-docbook-builder)
[native-search-paths]: Use $XML_CATALOG_FILES.
--8<---------------cut here---------------end--------------->8---

The rest LGTM!

-- 
Thanks,
Maxim