fdo#77282 Replace "Edit Group" with "Enter Group"

Command to enter in a group of objects should be the same in Writer and Draw
Update of Help in commit 8944

Change-Id: I39d9c9f9e969978f4084703d2468bdf8a2bf7372
Reviewed-on: https://gerrit.libreoffice.org/8923
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>
Tested-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>