fix tutorial documentation (elastic#55996)

docs/developer/add-data-guide.asciidoc

@@ -11,20 +11,24 @@ Each tutorial contains three sets of instructions:
 
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 === Creating a new tutorial
-1. Create a new directory in the link:https://github.com/elastic/kibana/tree/master/src/legacy/core_plugins/kibana/server/tutorials[tutorials directory].
-2. In the new directory, create a file called `index.js` that exports a function.
-The function must return a JavaScript object that conforms to the link:https://github.com/elastic/kibana/blob/master/src/legacy/core_plugins/kibana/common/tutorials/tutorial_schema.js[tutorial schema].
-3. Register the tutorial in link:https://github.com/elastic/kibana/blob/master/src/legacy/core_plugins/kibana/server/tutorials/register.js[register.js] by calling `server.registerTutorial(myFuncImportedFromIndexJs)`.
+1. Create a new directory in the link:https://github.com/elastic/kibana/tree/master/src/plugins/home/server/tutorials[tutorials directory].
+2. In the new directory, create a file called `index.ts` that exports a function.
+The function must return a function object that conforms to the `TutorialSchema` interface link:https://github.com/elastic/kibana/blob/master/src/plugins/home/server/services/tutorials/lib/tutorial_schema.ts[tutorial schema].
+3. Register the tutorial in link:https://github.com/elastic/kibana/blob/master/src/plugins/home/server/tutorials/register.ts[register.ts] by adding it to the `builtInTutorials`.
+// TODO update path once assets are migrated
 4. Add image assets to the link:https://github.com/elastic/kibana/tree/master/src/legacy/core_plugins/kibana/public/home/tutorial_resources[tutorial_resources directory].
 5. Run Kibana locally to preview the tutorial.
 6. Create a PR and go through the review process to get the changes approved.
 
+If you are creating a new plugin and the tutorial is only related to that plugin, you can also place the `TutorialSchema` object into your plugin folder. Add `home` to the `requiredPlugins` list in your `kibana.json` file.
+Then register the tutorial object by calling `home.tutorials.registerTutorial(tutorialObject)` in the `setup` lifecycle of your server plugin.
+
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 ==== Variables
 String values can contain variables that are substituted when rendered. Variables are specified by `{}`.
 For example: `{config.docs.version}` is rendered as `6.2` when running the tutorial in Kibana 6.2.
 
-link:https://github.com/elastic/kibana/blob/master/src/legacy/core_plugins/kibana/public/home/components/tutorial/replace_template_strings.js#L23[Provided variables]
+link:https://github.com/elastic/kibana/blob/master/src/legacy/core_plugins/kibana/public/home/np_ready/components/tutorial/replace_template_strings.js#L23[Provided variables]
 
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 ==== Markdown