Locking files on WebDAV shares was implemented in tdf#82744,
in particular:

commit 26e6d4b0
    tdf#82744: fix WebDAV lock/unlock behaviour - part 1
commit bc9a8ddb
    tdf#82744: fix WebDAV lock/unlock behaviour - part 2
commit b4576f3d
    tdf#82744: fix WebDAV lock/unlock behaviour - part 3
commit fed29842
    tdf#82744: fix WebDAV lock/unlock behaviour - part 4

Before that, files on WebDAV shares were accessed w/o locking since
the beginning of [OOo] time. This option allows to revert to
the old behaviour i.e. non-locking WebDAV access.

For concurrent read-write WebDAV access by multiple users it is
recommended to keep UseWebDAVFileLocking at default value (true)

Change-Id: Id92177631d4854d6c7bf412164acbd9740db9592
Reviewed-on: https://gerrit.libreoffice.org/64116
Tested-by: Jenkins
Reviewed-by: Thorsten Behrens <Thorsten.Behrens@CIB.de>