Update git submodules

* Update helpcontent2 from branch 'master'
  - DB help content clean-up
    
    Change-Id: Id5a3f2bd17d4e6a159fe6322eb9cec8012cc9d51
    Reviewed-on: https://gerrit.libreoffice.org/60487
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ f7606a55

-Subproject commit 94177b1022a9a4f49743ab4d97169ff42315eea5
+Subproject commit f7606a55bb58a5c30dce04427340719856e66ac9