Compatibility chart update

What does this MR do?

Updates Compatibility chart in accordance with the recently done changes.

Related issues

-

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docs/executors/index.md

@@ -118,7 +118,7 @@ Supported features by different executors:
 |:---------------------------------------------|:----:|:-------:|:----------:|:---------:|:------:|:----------:|:------:|
 | Secure Variables                             | ✓    | ✓       | ✓          | ✓         | ✓      | ✓          | ✓      |
 | GitLab Runner Exec command                   | ✗    | ✓       | ✗          | ✗         | ✓      | ✓          | ✓      |
-| `gitlab-ci.yml`: image                       | ✗    | ✗       | ✓ (2)      | ✓ (2)     | ✓      | ✓          | ✓ (via [`$CUSTOM_ENV_CI_JOB_IMAGE`](custom.md#stages)      |
+| `gitlab-ci.yml`: image                       | ✗    | ✗       | ✓ (2)      | ✓ (2)     | ✓      | ✓          | ✓ (via [`$CUSTOM_ENV_CI_JOB_IMAGE`](custom.md#stages))      |
 | `gitlab-ci.yml`: services                    | ✗    | ✗       | ✗          | ✗         | ✓      | ✓          | ✓      |
 | `gitlab-ci.yml`: cache                       | ✓    | ✓       | ✓          | ✓         | ✓      | ✓          | ✓      |
 | `gitlab-ci.yml`: artifacts                   | ✓    | ✓       | ✓          | ✓         | ✓      | ✓          | ✓      |