This patch applies xmllint --format to fix identation of the XHP file.
This patch will be followed by a fix to bug tdf#100480
Change-Id: I4408bbf2b9be81bc28f2bad95692008fbd3634ea
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/120886
Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>