fix quality issues in Security concepts

[haarer]

Please fix quality issues in Security concepts.
E.g.
https://saf.gfse.org/devdoc/concepts/Concept_Sec_ContextAndAssetIdentification.html

• Relational concepts shall be stereotyped
• Multiplicities shall be specified
• Concepts shall be documented
• Direction arrows shall be shown

Please see https://saf.gfse.org/devdoc/metamodel-guideline/modelguideline.html for guidance and examples