[gardening] Tweak comment wording

Author: benlangmuir

lib/IDE/Formatting.cpp

@@ -668,7 +668,7 @@ class FormatWalker : public SourceEntityWalker {
   SiblingCollector SCollector;
 
   /// Sometimes, target is a part of "parent", for instance, "#else" is a part
-  /// of an ifconfigstmt, so that ifconfigstmt is not really the parent of "#else".
+  /// of an IfConfigDecl, so that IfConfigDecl is not really the parent of "#else".
   bool isTargetPartOf(swift::ASTWalker::ParentTy Parent) {
     if (auto Conf = dyn_cast_or_null<IfConfigDecl>(Parent.getAsDecl())) {
       for (auto Clause : Conf->getClauses()) {