Bump paper number to R10

ednolan · ednolan · commit fb02c782160d · 2025-12-15T03:56:16.000Z
diff --git a/paper/P2728.md b/paper/P2728.md
@@ -1,7 +1,7 @@
 ---
 title: "Unicode in the Library, Part 1: UTF Transcoding"
-document: D2728R10
-date: 2025-11-17
+document: P2728R10
+date: 2025-12-15
 audience:
   - SG-16 Unicode
   - SG-9 Ranges
