Add line documenting DS_REMEDIATE

- Update formatting of default value for BUNDLER_AUDIT_UPDATE_DISABLED

doc/user/application_security/dependency_scanning/index.md

@@ -160,6 +160,7 @@ The following variables are used for configuring specific analyzers (used for a
 | `GEMNASIUM_DB_LOCAL_PATH`               | `gemnasium`        | `/gemnasium-db`              | Path to local gemnasium database. |
 | `GEMNASIUM_DB_REMOTE_URL`               | `gemnasium`        | `https://gitlab.com/gitlab-org/security-products/gemnasium-db.git` | Repository URL for fetching the gemnasium database. |
 | `GEMNASIUM_DB_REF_NAME`                 | `gemnasium`        | `master`                     | Branch name for remote repository database. `GEMNASIUM_DB_REMOTE_URL` is required. |
+| `DS_REMEDIATE`                          | `gemnasium`        | `"true"`                       | Enable automatic remediation of vulnerable dependencies.  |
 | `PIP_INDEX_URL`                         | `gemnasium-python` | `https://pypi.org/simple`    | Base URL of Python Package Index. |
 | `PIP_EXTRA_INDEX_URL`                   | `gemnasium-python` |                              | Array of [extra URLs](https://pip.pypa.io/en/stable/reference/pip_install/#cmdoption-extra-index-url) of package indexes to use in addition to `PIP_INDEX_URL`. Comma separated. |
 | `PIP_REQUIREMENTS_FILE`                 | `gemnasium-python` |                              | Pip requirements file to be scanned. |
@@ -167,7 +168,7 @@ The following variables are used for configuring specific analyzers (used for a
 | `DS_PIP_DEPENDENCY_PATH`                | `gemnasium-python` |                              | Path to load Python pip dependencies from. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12412) in GitLab 12.2) |
 | `DS_PYTHON_VERSION`                     | `retire.js`        |                              | Version of Python. If set to 2, dependencies are installed using Python 2.7 instead of Python 3.6. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12296) in GitLab 12.1)|
 | `MAVEN_CLI_OPTS`                        | `gemnasium-maven`  | `"-DskipTests --batch-mode"` | List of command line arguments that will be passed to `maven` by the analyzer. See an example for [using private repos](#using-private-maven-repos). |
-| `BUNDLER_AUDIT_UPDATE_DISABLED`         | `bundler-audit`    | `false`                      | Disable automatic updates for the `bundler-audit` analyzer. Useful if you're running Dependency Scanning in an offline environment. |
+| `BUNDLER_AUDIT_UPDATE_DISABLED`         | `bundler-audit`    | `"false"`                      | Disable automatic updates for the `bundler-audit` analyzer. Useful if you're running Dependency Scanning in an offline, air-gapped environment.|
 | `BUNDLER_AUDIT_ADVISORY_DB_URL`         | `bundler-audit`    | `https://github.com/rubysec/ruby-advisory-db` | URL of the advisory database used by bundler-audit. |
 | `BUNDLER_AUDIT_ADVISORY_DB_REF_NAME`    | `bundler-audit`    | `master`                     | Git ref for the advisory database specified by `BUNDLER_AUDIT_ADVISORY_DB_URL`. |
 | `RETIREJS_JS_ADVISORY_DB`               | `retire.js`        | `https://raw.githubusercontent.com/RetireJS/retire.js/master/repository/jsrepository.json` | Path or URL to Retire.js js vulnerability data file. |