Fix comment for gen-clang-decl-nodes tblgen backend, from Michael Han

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123833 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/TableGen.cpp b/utils/TableGen/TableGen.cpp
index 61a8141..b1503d1 100644
--- a/utils/TableGen/TableGen.cpp
+++ b/utils/TableGen/TableGen.cpp
@@ -138,7 +138,7 @@
                     clEnumValN(GenClangDiagGroups, "gen-clang-diag-groups",
                                "Generate Clang diagnostic groups"),
                     clEnumValN(GenClangDeclNodes, "gen-clang-decl-nodes",
-                               "Generate Clang AST statement nodes"),
+                               "Generate Clang AST declaration nodes"),
                     clEnumValN(GenClangStmtNodes, "gen-clang-stmt-nodes",
                                "Generate Clang AST statement nodes"),
                     clEnumValN(GenLLVMCConf, "gen-llvmc",