Update sign-up restrictions with allow/denylist

doc/user/admin_area/settings/sign_up_restrictions.md

@@ -8,7 +8,7 @@ You can use sign-up restrictions to:
 
 - Disable new signups.
 - Require user email confirmation.
-- Blacklist or whitelist email addresses belonging to specific domains.
+- Denylist or allowlist email addresses belonging to specific domains.
 
 NOTE: **Note:**
 These restrictions are only applied during sign-up from an external user. An admin is
@@ -31,7 +31,7 @@ consider disabling new signups if you do not expect public users to sign up for
 account.
 
 Alternatively, you could also consider setting up a
-[whitelist](#whitelist-email-domains) or [blacklist](#blacklist-email-domains) on
+[allowlist](#allowlist-email-domains) or [denylist](#denylist-email-domains) on
 email domains to prevent malicious users from creating accounts.
 
 ## Require email confirmation
@@ -48,14 +48,14 @@ their email address before they are allowed to sign in.
 You can [change](../../../security/password_length_limits.md#modify-minimum-password-length-using-gitlab-ui)
 the minimum number of characters a user must have in their password using the GitLab UI.
 
-## Whitelist email domains
+## Allowlist email domains
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/598) in GitLab 7.11.0
 
 You can restrict users to only sign up using email addresses matching the given
 domains list.
 
-## Blacklist email domains
+## Denylist email domains
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/5259) in GitLab 8.10.
 
@@ -71,17 +71,17 @@ To access this feature:
 1. Navigate to the **Admin Area > Settings > General**.
 1. Expand the **Sign-up restrictions** section.
 
-For the blacklist, you can enter the list manually or upload a `.txt` file that
+For the denylist, you can enter the list manually or upload a `.txt` file that
 contains list entries.
 
-For the whitelist, you must enter the list manually.
+For the allowlist, you must enter the list manually.
 
-Both the whitelist and blacklist accept wildcards. For example, you can use
+Both the allowlist and denylist accept wildcards. For example, you can use
 `*.company.com` to accept every `company.com` subdomain, or `*.io` to block all
 domains ending in `.io`. Domains should be separated by a whitespace,
 semicolon, comma, or a new line.
 
-![Domain Blacklist](img/domain_blacklist.png)
+![Domain Denylist](img/domain_denylist.png)
 
 <!-- ## Troubleshooting