Update git submodules

* Update helpcontent2 from branch 'master'
  - Update list of replacement icons in master
    
    Change-Id: I3da2cac812591bf1a0eed69c4a8746592e9042e3
    Reviewed-on: https://gerrit.libreoffice.org/72969
    Tested-by: Jenkins
Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    

helpcontent2 @ 5eca0aaa

-Subproject commit d90be75f45fb27041b75c3feed230b01d0ee602c
+Subproject commit 5eca0aaa7f4bdc1f0d70695ba14f078c2d1df2f0