Update git submodules

* Update helpcontent2 from branch 'master'
  - Rename get_url.xsl to generate_hid2file.xsl, because that's what it's doing.
    
    Change-Id: I565ca442281fa8a80a59d1038d29b34d7f9d9f41
    Reviewed-on: https://gerrit.libreoffice.org/58989
    Tested-by: Jenkins
Reviewed-by: Jan Holesovsky <kendy@collabora.com>
    

helpcontent2 @ 3eea3745

-Subproject commit 780b5243abe260f6f37e9c5f6563c58fc2e20818
+Subproject commit 3eea3745e5ee142962eb509032266e0c5762e943