[DOCS] Update security deprecation message in migration guide#82816

Merged

lockewritesdocs merged 2 commits intoelastic:7.17from lockewritesdocs:docs__migrate-security-on-default

Jan 20, 2022

+19-6

Commits on Jan 19, 2022

[DOCS] Update security deprecation message in migration guide
Adam Locke
committed

Commits on Jan 20, 2022

Update deprecation description

Adam Locke
and
bytebilly
authored