[docs] remove legacy/experimental flags from config reference

[sarah11918]

Changes

This removes the docs JSDoc content for experimental and legacy flags from src/types/public/config.ts as these will now each have standalone pages maintained in docs.

• legacy.collections, clientPrerender and contentIntellisense are already live in beta 5 docs now with their own pages
• svg and responsiveImages each have open docs PRs ready to merge on feature release that will add their respective pages

Testing

No tests! (Please check I removed the correct level of parenthesis!) 😄

Docs

Only docs; will stop docs from pulling in this content, and it will be maintained in the docs repo now.

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Latest commit: 7403a095a6e34289c7ad6de180888859fbd88a95

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