docs/21-ui-reference.md: added the four Stage 2 printer-settings accessibility identifiers shipped in #183/#186 to both the Stage 2 roster and the master id list: paperSizeGroup, printerPaperSizeSelect, qualityGroup, printerQualitySelect.
Docs-only hygiene for milestone 11.
- `docs/21-ui-reference.md`: added the four Stage 2 printer-settings accessibility identifiers shipped in #183/#186 to both the Stage 2 roster and the master id list: `paperSizeGroup`, `printerPaperSizeSelect`, `qualityGroup`, `printerQualitySelect`.
- No product code, tests, or config touched.
Refs #183
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Docs-only hygiene for milestone 11.
docs/21-ui-reference.md: added the four Stage 2 printer-settings accessibility identifiers shipped in #183/#186 to both the Stage 2 roster and the master id list:paperSizeGroup,printerPaperSizeSelect,qualityGroup,printerQualitySelect.Refs #183