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Docs: the Image Trace page describes the background line between Abutting colors

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With Method Abutting, neighboring colors share one exact edge. The canvas
smooths each path's edges on its own, so each path covers only part of the
pixels along that edge, and a thin line of the background can show between
the colors. The adjustments page did not say so. It now describes the line,
names the default and the presets that use Abutting (Default, Auto Color,
3 Colors, 6 Colors and 16 Colors), says which exports show it (SVG and PDF
in most viewers; raster exports with Type Optimized, or with Art Optimized
above 10 million pixels or 16,384 pixels on a side), and points to
Overlapping, which stacks the colors and shows no background along shared
edges.
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@@ -32,6 +32,18 @@ white beside a cream), at most six; scattered specks of a colour add none. Adobe
its own palettes are chosen; this is VectorCraft's own method (see
[image-trace-quality.md](image-trace-quality.md#auto-color-keeps-rare-colours)).
**Abutting and Overlapping.** Abutting is the default Method, and the Default, Auto Color, 3 Colors,
6 Colors and 16 Colors presets use it. With Abutting, two neighboring colors share one exact edge. The
canvas smooths the edges of each path on its own, so each of the two paths covers only part of the
pixels along that edge, and a thin line of the background can show between the colors. Web browsers
and PDF viewers usually draw an exported SVG or PDF file the same way and show the same line. Raster
exports (PNG, JPEG, TIFF and the other bitmap formats) with None anti-aliasing do not show it at any
size. Raster exports with Art Optimized anti-aliasing, the default, do not show it up to 10 million
pixels and 16,384 pixels on a side. A raster export shows the line as the canvas does when it uses
Type Optimized anti-aliasing, or when it uses Art Optimized and is larger than either limit.
Overlapping stacks the colors instead: a lower color continues under the edge of the color above it,
and no background shows along that edge.
**Large images.** An image of more than 1500 pixels on a side is traced as any other, only more
slowly, and the trace says so: `imageTrace.make` returns the note in `warnings` and the status bar
shows it (the [results optimization](https://helpx.adobe.com/illustrator/using/image-trace-results-optimization.html)