docs(site): document the SVG Marker component

[diegomura]

Adds the missing <Marker /> docs page (props table plus a runnable example with an arrowhead on a line and dots on every polyline vertex), registered in the sidebar meta, the SVG section index, and the playground autocomplete. Also documents the markerStart / markerMid / markerEnd and clipPath presentation attributes, which were absent from that table, and adds break and minPresenceAhead rows to the View, Text, Image, ImageBackground, Link, Note, and Canvas prop tables — they were only mentioned in prose on the advanced pages. Page is deliberately left out of that last change, since both props are only read for a page's children. Example output verified by rendering it against @react-pdf/renderer@4.9.0.

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Project	Deployment	Actions	Updated (UTC)
react-pdf	Ready	Preview	Aug 27, 2026 11:20pm

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