[Authz] Added section for migration routes created by utility function (#198401)

## Summary

- Added section for migrating routes created by utility function.
- Added `patch` method to route methods in eslint rule.


### Checklist
- [x]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials

dev_docs/key_concepts/api_authorization.mdx

@@ -313,6 +313,23 @@ Routes without a compelling reason to opt-out of authorization should plan to in
 MIGRATE_DISABLED_AUTHZ=true MIGRATE_ENABLED_AUTHZ=true npx eslint --ext .ts --fix path/to/your/folder
 ```
 
+**How to migrate if you have an utility function for route creation?**
+If you have utility function that creates routes, i.e `createApmServerRoute` or `createObservabilityOnboardingServerRoute`, you can easily modify the eslint rule to handle your case.
+For example, you register the route with `access` tags in your utility function:
+```ts
+createApmServerRoute({
+  endpoint: 'GET /your/route/path',
+  options: { tags: ['access:apm'] },
+  handler: async (resources):  => {
+    // your handler logic
+  },
+})
+```
+You can modify [the rule](https://github.com/elastic/kibana/blob/6a50066e00ae38a64c5365fd66b4dc32857ba1fc/packages/kbn-eslint-plugin-eslint/rules/no_deprecated_authz_config.js#L312-#L315) to handle your case by adding the following code:
+```ts
+callee.type === 'Identifier' && callee.name === 'createApmServerRoute'
+```
+
 ## Questions?
 If you have any questions or need help with API authorization, please reach out to the `@elastic/kibana-security` team.
 

packages/kbn-eslint-plugin-eslint/rules/no_deprecated_authz_config.js

@@ -7,7 +7,7 @@
  * License v3.0 only", or the "Server Side Public License, v 1".
  */
 
-const routeMethods = ['get', 'put', 'delete', 'post'];
+const routeMethods = ['get', 'put', 'delete', 'post', 'patch'];
 const ACCESS_TAG_PREFIX = 'access:';
 
 const isStringLiteral = (el) => el.type === 'Literal' && typeof el.value === 'string';