Editorial

[tschmidtb51]

• product_identification_helper missing in /$defs/full_product_name_t/model_number in conformance.md
• product_identification_helper missing in /$defs/full_product_name_t/serial_number in conformance.md
• check indent on /document/license_expression in conformance.md

[tschmidtb51]

• unify "as a quick fix" (instead of "as quick fix")

[tschmidtb51]

• correct conversion rules regarding metrics
• fix spelling of Bug Tracker