Ninja: Update comment variable reference

Source/cmNinjaNormalTargetGenerator.cxx

@@ -642,7 +642,8 @@ void cmNinjaNormalTargetGenerator::WriteLinkStatement()
       }
     }
   }
-  // If we have any PRE_LINK commands, we need to go back to HOME_OUTPUT for
+  // If we have any PRE_LINK commands, we need to go back to CMAKE_BINARY_DIR
+  // for
   // the link commands.
   if (!preLinkCmdLines.empty()) {
     const std::string homeOutDir = localGen.ConvertToOutputFormat(