Add WMAS2024 Errata to Support Table

[JohnRiv]

Errata-related changed relevant for Support Table:

3.6 Graphics specifications

• Remove “HTML Canvas 2D Context [2DCONTEXT]”
• Add this bullet point as the last item in the list:
  • “Note: HTML Canvas 2D Context is also required as part of the HTML specification [HTML].”

3.9 Security specifications

• Add this bullet point to be the 2nd bullet:
  • “HTTP Strict Transport Security (HSTS) [RFC6797]”