/usr/share/gnome/help/gnome-doc-xslt/C/ is in gnome-doc-utils 0.20.10-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/gnome/help/gnome-doc-xslt/C/db-chunk.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db-common.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db-label.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db-title.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db-xref.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-autotoc.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-bibliography.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-block.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-callout.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-classsynopsis.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-cmdsynopsis.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-css.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-division.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-ebnf.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-footnote.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-funcsynopsis.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-index.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-info.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-inline.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-l10n.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-list.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-media.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-qanda.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-refentry.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-table.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-title.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html-xref.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2html.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2omf.xml
/usr/share/gnome/help/gnome-doc-xslt/C/db2xhtml.xml
/usr/share/gnome/help/gnome-doc-xslt/C/gettext.xml
/usr/share/gnome/help/gnome-doc-xslt/C/gnome-doc-xslt.xml
/usr/share/gnome/help/gnome-doc-xslt/C/l10n-numbers.xml
/usr/share/gnome/help/gnome-doc-xslt/C/legal.xml
/usr/share/gnome/help/gnome-doc-xslt/C/theme.xml
/usr/share/gnome/help/gnome-doc-xslt/C/translating.xml
/usr/share/gnome/help/gnome-doc-xslt/C/utils.xml