[clang][bytecode][NFC] Fix a commented-out test

Author: tbaederr

clang/test/AST/ByteCode/cxx20.cpp

@@ -641,7 +641,7 @@ namespace ThreeWayCmp {
   constexpr const int *pa2 = &a[2];
   constexpr const int *pb1 = &b[1];
   static_assert(pa1 <=> pb1 != 0, ""); // both-error {{not an integral constant expression}} \
-                                       // both-note {{has unspecified value}} \
+                                       // both-note {{has unspecified value}}
   static_assert(pa1 <=> pa1 == 0, "");
   static_assert(pa1 <=> pa2 == -1, "");
   static_assert(pa2 <=> pa1 == 1, "");