Remove docs for fields not in the spec#408

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gsfk wants to merge 6 commits intoga4gh:masterfrom

gsfk:docs/remove-nonexistent-fields

Commits on Nov 11, 2025

remove docs for Exposure, discussed but never added to schema
gsfk
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remove docs for Pharmaceutical Treatment, discussed but not part of schema (ultimately became Medical Action)
gsfk
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remove docs for StopReason, removed from schema in 2020 by commit d53e7203c16e30612a60a3e278cfa5de2ed051b8
gsfk
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remove orphaned docs file that refers to v2 as in development, file is deprecated as doesn't appear anywhere on the docs page
gsfk
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remove docs for ApiVersion, removed from spec in commit f73b4bd5ad966321d3d6b3c7ff8aa8f63820941b
gsfk
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remove docs for Interval, replaced by TimeInterval in commit 2192c09337b09475fdac843393f7c02de90c2b77
gsfk
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