Update git submodules

* Update helpcontent2 from branch 'master'
  - Fix typo
    
    Change-Id: Id8405664e2045529826ba634986c414db742cc3b
    Reviewed-on: https://gerrit.libreoffice.org/64702
    Tested-by: Jenkins
Reviewed-by: Julien Nabet <serval2412@yahoo.fr>
    

helpcontent2 @ 8e718f78

-Subproject commit 4c0b3129e36d461f4d93ba924075cf6ec3e7ded1
+Subproject commit 8e718f78ec456aa228240da579780391b51e8d9a