Add more details around:
- What we consider a breaking change
- What is a deprecation
- How do we guarantee Angular stays stable
- Update invalid links
PR Close#51423
Clarify the range of TypeScript versions supported in Angular v15 and v16 upgrade guides. The previous documentation's phrasing led to potential misunderstandings, as it suggested broader compatibility than actually supported. This change prevents errors by explicitly stating the maximum TypeScript version for each Angular version, ensuring developers have clear guidance during upgrades.
PR Close#54131
