Fall2025 errata

[mbgower]

Updates the errata documents for 2.2 and 2.1 to list the 5 new editorial changes held for the quarterly update.

These are:

• 2025-10-15: Rewording the normative preamble of Content on Hover or Focus for clarity (#4469)
• 2025-10-15: Changing occurrences of "e-mail" to "email" (#4385)
• 2025-10-15: Removing use of "must" in section 7 preamble (#4458)
• 2025-10-15: Fixing the markup for the notes in the "abbreviation" definition (#4452)
• 2025-10-15: Changing capitalized occurrences of "Web" and "Success Criteria" to match the established lower-case style (#4461)

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