Epic: Phase 2 — DOCLANG Core Spec ISO/IEC alignment

[PeterStaar-IBM]

This epic tracks the Phase 2 changes required to align the DOCLANG Core Spec with the ISO/IEC Directives, Part 2.
Imported from changes_to_doclang_spec.docx.

Progress: 0 / 23 complete

Done	Feature	Issue
[ ]	Cross-Reference Normalization	#123
[ ]	Hanging Paragraph Subclauses	#124
[ ]	Orphan Subclause Remediation	#125
[ ]	XML Tag Typography	#126
[ ]	Formal Language Notation	#127
[ ]	Attribute Value Enumerations	#128
[ ]	Number Formatting	#129
[ ]	Printable URI / URL Strings	#130
[ ]	Bi-directional Reference Auditing	#131
[ ]	Font and Style Normalization	#132
[ ]	Informative Code / Example Marking	#133
[ ]	Example Separation	#134
[ ]	Tabular Formats	#135
[ ]	Non-Normative Implementation Narrative	#136
[ ]	Mermaid Diagram Transmutation	#137
[ ]	Graphic Text Normalization	#138
[ ]	Bibliography Construction	#139
[ ]	Asset Caption Formatting	#140
[ ]	Commercial Tools Footnotes	#141
[ ]	Mathematical Interval & Unit Formatting	#142
[ ]	Percentage Symbol Clean-up	#143
[ ]	Schema Placeholder Optimization	#144
[ ]	Subscript Coordinate Notation	#145