PY-15447, PY-15448 Fix help ID in several Python refactorings

* Added help IDs for "Extract Superclass" and "Push Members Down"
* Changed help ID in "Introduce Variable"

python/src/com/jetbrains/python/refactoring/classes/extractSuperclass/PyExtractSuperclassViewSwingImpl.java

@@ -25,6 +25,7 @@ import com.intellij.refactoring.RefactoringBundle;
 import com.jetbrains.python.psi.PyClass;
 import com.jetbrains.python.refactoring.classes.membersManager.vp.MembersBasedViewSwingImpl;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
 import java.awt.*;
@@ -120,4 +121,10 @@ class PyExtractSuperclassViewSwingImpl
   public String getSuperClassName() {
     return myExtractedSuperNameField.getText();
   }
+
+  @Nullable
+  @Override
+  protected String getHelpId() {
+    return "refactoring.extract.superclass.dialog";
+  }
 }

python/src/com/jetbrains/python/refactoring/classes/pushDown/PyPushDownViewSwingImpl.java

@@ -21,6 +21,7 @@ import com.jetbrains.python.psi.PyClass;
 import com.jetbrains.python.refactoring.classes.membersManager.vp.MembersBasedViewSwingImpl;
 import com.jetbrains.python.refactoring.classes.membersManager.vp.MembersViewInitializationInfo;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.awt.*;
 
@@ -38,4 +39,10 @@ public class PyPushDownViewSwingImpl extends MembersBasedViewSwingImpl<PyPushDow
     myCenterPanel.add(myPyMemberSelectionPanel, BorderLayout.CENTER);
     setTitle(PyPushDownHandler.REFACTORING_NAME);
   }
+
+  @Nullable
+  @Override
+  protected String getHelpId() {
+    return "refactoring.pushMembersDown";
+  }
 }

python/src/com/jetbrains/python/refactoring/introduce/variable/PyIntroduceVariableHandler.java

@@ -52,7 +52,7 @@ public class PyIntroduceVariableHandler extends IntroduceHandler {
 
   @Override
   protected String getHelpId() {
-    return "python.reference.introduceVariable";
+    return "refactoring.introduceVariable";
   }
 
   @Override