Update git submodules

* Update helpcontent2 from branch 'distro/collabora/cp-6.0'
  - [cp] Avoid the donation link.
    
    Change-Id: Ifcf7cf9d3eddcbd2698331f3ca22410427107fb0
    Reviewed-on: https://gerrit.libreoffice.org/58796Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>
    

helpcontent2 @ 39575071

-Subproject commit 64c9b128c0f84e4a1d71cf9fd43532182ea8ba20
+Subproject commit 395750718d5c37309d754c82e82cccfab41e9d59