stabletailgraph: clarify omission of linear parts in test sorts
Those are not interesting and are collapsed using globs.
Only the tagged nodes are interesting.
--- a/tests/test-stabletailgraph.t Fri Apr 28 11:50:49 2023 +0200
+++ b/tests/test-stabletailgraph.t Fri Apr 28 12:12:42 2023 +0200
@@ -8,7 +8,7 @@
Each case consists of the creation of the interesting graph structure, followed
by a check, for each noteworthy node, of:
-- the stable-tail sort output.
+- the stable-tail sort output (with the linear parts globbed).
In the ASCII art of the diagrams, the side of the exclusive part which is
followed in priority is denoted with "<" or ">" if it is on the left or right