Update output of boundary test

Author: natsukagami

tests/neg-custom-args/captures/boundary.check

@@ -2,15 +2,15 @@
  4 |  boundary[AnyRef^]:
  5 |    l1 ?=> // error // error
    |  ^
-   |Found:    scala.util.boundary.Label[Object^?]^{cap.rd}
+   |Found:    scala.util.boundary.Label[Object^'s1]^{cap.rd}
    |Required: scala.util.boundary.Label[Object^]^²
    |
-   |where:    ^   refers to the universal root capability
-   |          ^²  refers to a fresh root capability classified as Control in the type of value local
-   |          cap is a fresh root capability classified as Control created in value local when constructing Capability instance scala.util.boundary.Label[Object^?]
+   |Note that capability cap² cannot be included in outer capture set 's1.
    |
-   |Note that capability cap
-   |cannot be included in outer capture set ?.
+   |where:    ^    refers to the universal root capability
+   |          ^²   refers to a fresh root capability classified as Control in the type of value local
+   |          cap  is a fresh root capability classified as Control created in value local when constructing Capability instance scala.util.boundary.Label[Object^'s1]
+   |          cap² is the universal root capability
  6 |      boundary[Unit]: l2 ?=>
  7 |        boundary.break(l2)(using l1)
  8 |      ???
@@ -30,10 +30,12 @@
    |  Found:    scala.util.boundary.Break[AnyRef^] @unchecked
    |  Required: scala.util.boundary.Break[Object^²] @unchecked
    |
-   |  where:    ^  refers to the universal root capability
-   |            ^² refers to a fresh root capability created in package <empty>
+   |  Note that capability cap is not included in capture set {cap²}.
    |
-   |  Note that capability cap is not included in capture set {cap}.
+   |  where:    ^    refers to the universal root capability
+   |            ^²   refers to a fresh root capability created in package <empty>
+   |            cap  is a fresh root capability created in package <empty>
+   |            cap² is the universal root capability
  6 |      boundary[Unit]: l2 ?=>
  7 |        boundary.break(l2)(using l1)
  8 |      ???