fix the order of backdrop vs path_count

doc/images/vello-diagram.svg

diff --git a/doc/images/vello-diagram.svg b/doc/images/vello-diagram.svg
index c12b8cb..4620892 100644
--- a/doc/images/vello-diagram.svg
+++ b/doc/images/vello-diagram.svg
@@ -1501,19 +1501,19 @@
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            x="66.94165"
-           y="83.798988">ptcl</tspan></text><text
+           y="83.798988">seg_counts</tspan></text><text
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@@ -1644,7 +1644,7 @@
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-           y="95.969826">seg_counts</tspan></text><text
+           y="95.969826">ptcl</tspan></text><text
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@@ -1702,11 +1702,11 @@
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@@ -1718,8 +1718,8 @@
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@@ -1729,7 +1729,7 @@
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@@ -1738,7 +1738,7 @@
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@@ -1747,7 +1747,7 @@
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@@ -1756,67 +1756,65 @@
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-         id="tspan17"><tspan
-           style="fill:#000000"
-           id="tspan16">(tile.backdrop)&#10;</tspan></tspan></text><text
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-         id="tspan19"><tspan
+         id="tspan18"><tspan
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-         id="tspan21"><tspan
+         id="tspan20"><tspan
            style="fill:#000000"
-           id="tspan20">(segments, ptcl, blend)&#10;</tspan></tspan></text><text
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-         id="tspan23"><tspan
+         id="tspan22"><tspan
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-         id="tspan25"><tspan
+         id="tspan24"><tspan
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+           id="tspan23">SegmentCount</tspan></tspan></text><text
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-         id="tspan27"><tspan
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    style="font-style:italic"
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+   id="tspan25">Intermediate data structure</tspan><tspan
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+   id="tspan27"> </tspan></tspan><tspan
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+         id="tspan29"><tspan
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