docs: [chat] update reference documentation for SelectionInput.DROPDOWN to include dynamic data sources and autosuggestion
#7128
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docs: update copyright to 2026
PiperOrigin-RevId: 864941572
Source-Link: googleapis/googleapis@2ca9449
Source-Link: https://github.com/googleapis/googleapis-gen/commit/28016886fed3a24dfe11622532a2027a3d791177
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