Apply suggestions from code review

Co-authored-by: Oliver Bračevac <bracevac@users.noreply.github.com>

Author: noti0na1

tests/neg/cc-poly-2.scala

@@ -10,7 +10,7 @@ object Test:
 
   def test(c1: C, c2: C) =
     val d: D^ = D()
-    // f[Nothing](d) // already rule out at typer
+    // f[Nothing](d) // already ruled out at typer
     f[CapSet^{c1}](d) // error
     val x = f(d)
     val _: D^{c1} = x // error

tests/pos-custom-args/captures/cc-poly-varargs.scala

@@ -13,7 +13,7 @@ def either[T1, T2, Cap^](
   val left = src1.transformValuesWith(Left(_))
   val right = src2.transformValuesWith(Right(_))
   race[Either[T1, T2], Cap](left, right)
-  // Explcit type arguments are required here because the second argument
+  // Explicit type arguments are required here because the second argument
   // is inferred as `CapSet^{Cap^}` instead of `Cap`.
-  // Although `CapSet^{Cap^}` subsums `Cap` in terms of capture set,
+  // Although `CapSet^{Cap^}` subsumes `Cap` in terms of capture sets,
   // `Cap` is not a subtype of `CapSet^{Cap^}` in terms of subtyping.