docs: Add note about downloading HTML schematics
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TEST=view in gitiles
# Dragonclaw Fingerprint Development Board Schematics
-The schematics are in the [HTML file] and viewable with any browser.
+The schematics are in the [HTML file][schematic] and viewable with any browser.
+Note that you'll need to download and save the HTML file from
+[this link][schematic]; you cannot view it directly from the server.
The layout file is in the [`.brd`] file.
[`.brd`]: https://raw.githubusercontent.com/coreboot/chrome-ec/master/docs/schematics/dragonclaw/dragonclaw_v0.2.brd
-[HTML file]: https://raw.githubusercontent.com/coreboot/chrome-ec/master/docs/schematics/dragonclaw/dragonclaw_v0.2.html
+[schematic]: https://raw.githubusercontent.com/coreboot/chrome-ec/master/docs/schematics/dragonclaw/dragonclaw_v0.2.html
