Add missing part of dotenv limit docs

doc/administration/instance_limits.md

@@ -400,7 +400,7 @@ limit is checked every time a new trigger is created.
 If a new trigger would cause the total number of pipeline triggers to exceed the
 limit, the trigger is considered invalid.
 
-Set the limit to `0` to disable it. Defaults to `0` on self-managed instances.
+Set the limit to `0` to disable it. Defaults to `150` on self-managed instances.
 
 To set this limit to `100` on a self-managed installation, run the following in the
 [GitLab Rails console](operations/rails_console.md#starting-a-rails-console-session):

doc/ci/yaml/artifacts_reports.md

@@ -173,9 +173,11 @@ The exceptions to the [original dotenv rules](https://github.com/motdotla/dotenv
 
 - The variable key can contain only letters, digits, and underscores (`_`).
 - The maximum size of the `.env` file is 5 KB.
-- In GitLab 13.5 and older, the maximum number of inherited variables is 10.
-- In [GitLab 13.6 and later](https://gitlab.com/gitlab-org/gitlab/-/issues/247913),
-  the maximum number of inherited variables is 20.
+  This limit [can be changed on self-managed instances](../../administration/instance_limits.md#limit-dotenv-file-size).
+- On GitLab.com, [the maximum number of inherited variables](../../user/gitlab_com/index.md#gitlab-cicd)
+  is 50 for Free, 100 for Premium and 150 for Ultimate. The default for
+  self-managed instances is 150, and can be changed by changing the
+  `dotenv_variables` [application limit](../../administration/instance_limits.md#limit-dotenv-variables).
 - Variable substitution in the `.env` file is not supported.
 - The `.env` file can't have empty lines or comments (starting with `#`).
 - Key values in the `env` file cannot have spaces or newline characters (`\n`), including when using single or double quotes.

doc/user/gitlab_com/index.md

@@ -141,7 +141,7 @@ the related documentation.
 | [Scheduled Job Archival](../../user/admin_area/settings/continuous_integration.md#archive-jobs) | 3 months | Never |
 | Max test cases per [unit test report](../../ci/unit_test_reports.md) | `500_000` | Unlimited |
 | [Max registered runners](../../administration/instance_limits.md#number-of-registered-runners-per-scope) | Free tier: `50` per-group / `50` per-project <br/> All paid tiers: `1_000` per-group  / `1_000` per-project | `1_000` per-group / `1_000` per-project |
-| [Limit dotenv variables](../../administration/instance_limits.md#limit-dotenv-variables) | Free tier: `50` / Premium tier: `100` / Ultimate tier: `150` | Unlimited |
+| [Limit dotenv variables](../../administration/instance_limits.md#limit-dotenv-variables) | Free tier: `50` / Premium tier: `100` / Ultimate tier: `150` | 150 |
 
 ## Account and limit settings