Update Freeze Period documentation

Closes of https://gitlab.com/gitlab-org/gitlab/-/issues/218032

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/32526

doc/api/freeze_periods.md

@@ -11,7 +11,7 @@ interact with the Freeze Period API endpoints.
 
 ## List Freeze Periods
 
-Paginated list of Freeze Periods, sorted by `created_at`.
+Paginated list of Freeze Periods, sorted by `created_at` in ascending order.
 
 ```plaintext
 GET /projects/:id/freeze_periods

doc/user/project/releases/index.md

@@ -371,7 +371,7 @@ freeze periods, all will apply, and should they overlap, the freeze covers the
 complete overlapped period.
 
 During pipeline processing, GitLab CI creates an environment variable named
-`$CI_ENVIRONMENT_FROZEN` if the currently executing job is within a
+`$CI_DEPLOY_FREEZE` if the currently executing job is within a
 Freeze Period.
 
 To take advantage of this variable, create a `rules` entry in your
@@ -384,7 +384,7 @@ deploy_to_production:
   stage: deploy
   script: deploy_to_prod.sh
   rules:
-    - if: $CI_ENVIRONMENT_FROZEN == null
+    - if: $CI_DEPLOY_FREEZE == null
 ```
 
 <!-- ## Troubleshooting