Update git submodules

* Update helpcontent2 from branch 'master'
  - Help page for Impress  Remote Connection dialog
    
    Change-Id: Ia3525f58f876fd92b447b99fd148fb12e6ac461b
    Reviewed-on: https://gerrit.libreoffice.org/59531
    Tested-by: Jenkins
    Reviewed-by: Olivier Hallot <olivier.hallot@libreoffice.org>
    
diff --git a/helpcontent2 b/helpcontent2
index 87b5b6d..564c0ad3 160000
--- a/helpcontent2
+++ b/helpcontent2
@@ -1 +1 @@
Subproject commit 87b5b6d3532c532d297f1e9f67b018c34aa89c82
Subproject commit 564c0ad3687e6447db75fcbc6d64fb1a033055b2