[clang] [clang-format] Fix requires misannotation with comma (PR #65908)

[Owen Pan via cfe-commits]

================
@@ -1019,10 +1019,12 @@ TEST_F(TokenAnnotatorTest, UnderstandsRequiresClausesAndConcepts) {
 
   Tokens = annotate("void f() & requires(true) {}");
   EXPECT_EQ(Tokens.size(), 12u) << Tokens;
+  EXPECT_TOKEN(Tokens[5], tok::kw_requires, TT_RequiresClause);
   EXPECT_TOKEN(Tokens[4], tok::amp, TT_PointerOrReference);
----------------
owenca wrote:

```suggestion
  EXPECT_TOKEN(Tokens[4], tok::amp, TT_PointerOrReference);
  EXPECT_TOKEN(Tokens[5], tok::kw_requires, TT_RequiresClause);
```

https://github.com/llvm/llvm-project/pull/65908