Update git submodules

* Update helpcontent2 from branch 'master'
  - i#119731 Fix icon name
    
    Was wrongly named in 496aaf8cbcd030c1ddfbc3776c23edd08307b96e
    
    Change-Id: I42730caa995ed7e04b6a632ee0fa73091beeea84
    Reviewed-on: https://gerrit.libreoffice.org/69080
    Tested-by: Jenkins
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>
    

helpcontent2 @ 2400a5c5

-Subproject commit 3d0fcf7a37859e0e8b61d4a560042dfef6b3c99b
+Subproject commit 2400a5c557b93356d57bd5a0f16b8dfe0864074a