message: Update security_scanning.md
  Adding links and definitions.
diff: -Harbor comes with a built-in security scanning solution provided by the clair service. This service analyzes a specified container image for any installed packages, and collects the version numbers of those installed packages. The Clair service then searches the National Vulnerability Database for any CVE affecting those package versions. These vulnerabilities are then reported within Harbor for each individual container.
  +Harbor comes with a built-in security scanning solution provided by the Clair service. This service analyzes a specified container image for any installed packages, and collects the version numbers of those installed packages. The Clair service then searches the [National Vulnerability Database](https://nvd.nist.gov/) for any CVE (common vulnerabilities and exposures) affecting those package versions. These vulnerabilities are then reported within Harbor for each individual container.
  An example of a security scan in Harbor, showing applicable vulnerabilites for a scanned container:
  ![Harbor Security Scanning Example Image](scanning_image_1.png)
  