Tighten STR-016 roadmap record

docs/modernization/roadmap.md

@@ -3240,7 +3240,7 @@ Results:
   `draw_checkerboard`/helper-shape cleanup is archived under `DEBT-0036`.
 - `Canvas::draw_merge_branch_orchestration()` and
   `Canvas::draw_merge_temporary_paint_branch()` later kept narrowing
-  `DEBT-0036`; archival record of `STR-016` extraction.
+  `DEBT-0036`; archival `STR-016` record.
 - Canvas main-brush, dual-brush, and stroke-pad draw paths now use the tested
   `pp_paint_renderer` stroke-feedback plan to decide whether framebuffer fetch
   supplies destination color or the legacy OpenGL path must copy the target