[build scripts] add clarifying comments

GitOrigin-RevId: 6d59d3de2ed13957d20fefae7326897c359b75a2

jps/antLayout/src/jetbrains/antlayout/tasks/LayoutTask.java

@@ -11,6 +11,9 @@ import java.io.File;
 import java.util.ArrayList;
 import java.util.List;
 
+/**
+ * Assembles files and module outputs accordingly to the specified layout. Used by {@link org.jetbrains.intellij.build.impl.LayoutBuilder}. 
+ */
 public class LayoutTask extends Task {
     private final List<Content> containers = new ArrayList<>();
     private File destDir;

platform/build-scripts/groovy/org/jetbrains/intellij/build/impl/CompilationContextImpl.groovy

@@ -286,8 +286,8 @@ final class CompilationContextImpl implements CompilationContext {
     JpsJavaExtensionService.instance.getOrCreateProjectExtension(project).outputUrl = url
   }
 
-
   void exportModuleOutputProperties() {
+    // defines Ant properties which are used by jetbrains.antlayout.datatypes.IdeaModuleBase class to locate module outputs 
     for (JpsModule module : project.modules) {
       for (boolean test : [true, false]) {
         [module.name, getOldModuleName(module.name)].findAll { it != null}.each {