Update copy Git LFS settings

Context

This issue comes out of a discussion on a separate issue.

What this issue is about

Update the copy on the Git LFS settings (Group > Settings > General > Permissions and group features)

Current copy:

CleanShot_2023-04-03_at_10.01.39_2x

Suggested copy by @ashrafkhamis 

[Checkbox] Projects in this group can use Git LFS
           Possible to override in each project.