docs: article verifications 07-22-26 WordPress Hosting domains articles

[ahnikakuse]

Summary

• Ran the article-verifications workflow on the 5 flagged WordPress Hosting domains articles (issues [Review Due] docusaurus/docs/wordpress-hosting/domains/index.mdx #774–[Review Due] docusaurus/docs/wordpress-hosting/domains/understanding-dns-records.md #778)
• Fixed heading capitalization, em dashes, and converted bolded UI references (Domains tab, Connect a Domain, Add Domain, Make Primary, etc.) to inline code across all 5 files
• Removed a broken link (404) where a CNAME target value was written as a clickable hyperlink, in both managing-subdomains.md and point-a-new-domain-to-wordpress-hosting.md
• Repaired an unclosed bold-marker syntax bug in point-a-new-domain-to-wordpress-hosting.md
• Standardized numbered-list punctuation and converted bold "Part 1/Part 2" pseudo-headers to real ## headings in point-a-new-domain-to-wordpress-hosting.md, matching the pattern used in connect-a-custom-domain.md and godaddy-domain-setup.md
• Corrected a DNS propagation timing inconsistency (some articles said 24 hours, others said 48 hours) to a consistent 48 hours across index.mdx, understanding-dns-records.md, and point-a-new-domain-to-wordpress-hosting.md
• Removed two unverified product claims from index.mdx (zero-downtime domain transfer, SEO benefit of a primary domain) since neither could be confirmed from source material

Test plan

• Pre-push validation passed (frontmatter, tag balance, internal/external links, images) — see verification comments on issues [Review Due] docusaurus/docs/wordpress-hosting/domains/index.mdx #774–[Review Due] docusaurus/docs/wordpress-hosting/domains/understanding-dns-records.md #778
• Cloud Build succeeds on this branch
• Spot-check that heading/UI formatting renders correctly on the built pages

Closes #778
Closes #775
Closes #776
Closes #777
Closes #774

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