Document image field of CS as mandatory

doc/user/application_security/container_scanning/index.md

@@ -305,7 +305,7 @@ the report JSON unless stated otherwise. Presence of optional fields depends on
 | `vulnerabilities[].location.dependency.package.name` | Name of the package where the vulnerability is located.                                                                                                                                                                                                                                                                                                                                    |
 | `vulnerabilities[].location.dependency.version`      | Version of the vulnerable package. Optional.                                                                                                                                                                                                                                                                                                                                               |
 | `vulnerabilities[].location.operating_system`        | The operating system that contains the vulnerable package.                                                                                                                                                                                                                                                                                                                                 |
-| `vulnerabilities[].location.image`                   | The Docker image that was analyzed. Optional.                                                                                                                                                                                                                                                                                                                                              |
+| `vulnerabilities[].location.image`                   | The Docker image that was analyzed.                                                                                                                                                                                                                                                                                                                                                        |
 | `vulnerabilities[].identifiers`                      | An ordered array of references that identify a vulnerability on internal or external DBs.                                                                                                                                                                                                                                                                                                  |
 | `vulnerabilities[].identifiers[].type`               | Type of the identifier. Possible values: common identifier types (among `cve`, `cwe`, `osvdb`, and `usn`).                                                                                                                                                                                                                                                                                 |
 | `vulnerabilities[].identifiers[].name`               | Name of the identifier for display purpose.                                                                                                                                                                                                                                                                                                                                                |