Fix introduced version for email grace period feature

doc/security/user_email_confirmation.md

@@ -7,9 +7,9 @@ type: howto
 GitLab can be configured to require confirmation of a user's email address when
 the user signs up. When this setting is enabled:
 
-- For GitLab 12.1 and earlier, the user is unable to sign in until they confirm their
+- For GitLab 12.7 and earlier, the user is unable to sign in until they confirm their
   email address.
-- For GitLab 12.2 and later, the user [has 30 days to confirm their email address](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/31245).
+- For GitLab 12.8 and later, the user [has 30 days to confirm their email address](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/31245).
   After 30 days, they will be unable to log in and access GitLab features.
 
 In **Admin Area > Settings** (`/admin/application_settings/general`), go to the section

doc/user/admin_area/settings/sign_up_restrictions.md

@@ -39,9 +39,9 @@ email domains to prevent malicious users from creating accounts.
 You can send confirmation emails during sign-up and require that users confirm
 their email address. If this setting is selected:
 
-- For GitLab 12.1 and earlier, the user is unable to sign in until they confirm their
+- For GitLab 12.7 and earlier, the user is unable to sign in until they confirm their
   email address.
-- For GitLab 12.2 and later, the user [has 30 days to confirm their email address](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/31245).
+- For GitLab 12.8 and later, the user [has 30 days to confirm their email address](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/31245).
   After 30 days, they will be unable to log in and access GitLab features.
 
 ![Email confirmation](img/email_confirmation_v12_7.png)