Merge branch 'patch-153' into 'master'

Clarify access of CI_REGISTRY_PASSWORD and CI_REGISTRY_USER

See merge request gitlab-org/gitlab!34550

doc/ci/variables/predefined_variables.md

@@ -107,8 +107,8 @@ You can add a command to your `.gitlab-ci.yml` file to
 | `CI_PROJECT_VISIBILITY`                       | 10.3   | all    | The project visibility (internal, private, public)                                                                                                                                                                                                                                                                                                         |
 | `CI_REGISTRY`                                 | 8.10   | 0.5    | If the Container Registry is enabled it returns the address of GitLab's Container Registry. This variable will include a `:port` value if one has been specified in the registry configuration.                                                                                                                                                           |
 | `CI_REGISTRY_IMAGE`                           | 8.10   | 0.5    | If the Container Registry is enabled for the project it returns the address of the registry tied to the specific project                                                                                                                                                                                                                                   |
-| `CI_REGISTRY_PASSWORD`                        | 9.0    | all    | The password to use to push containers to the GitLab Container Registry                                                                                                                                                                                                                                                                                    |
-| `CI_REGISTRY_USER`                            | 9.0    | all    | The username to use to push containers to the GitLab Container Registry                                                                                                                                                                                                                                                                                    |
+| `CI_REGISTRY_PASSWORD`                        | 9.0    | all    | The password to use to push containers to the GitLab Container Registry, for the current project.                                                                                                                                                                                                                                                                |
+| `CI_REGISTRY_USER`                            | 9.0    | all    | The username to use to push containers to the GitLab Container Registry, for the current project.                                                                                                                                                                                                                                                                 |
 | `CI_REPOSITORY_URL`                           | 9.0    | all    | The URL to clone the Git repository                                                                                                                                                                                                                                                                                                                        |
 | `CI_RUNNER_DESCRIPTION`                       | 8.10   | 0.5    | The description of the runner as saved in GitLab                                                                                                                                                                                                                                                                                                           |
 | `CI_RUNNER_EXECUTABLE_ARCH`                   | all    | 10.6   | The OS/architecture of the GitLab Runner executable (note that this is not necessarily the same as the environment of the executor)                                                                                                                                                                                                                        |