message: docs: update catalog docs to point to catalog-node
diff: @@ -57,7 +57,7 @@ The recommended way of instantiating the catalog backend classes is to use the
  `CatalogBuilder`, as illustrated in the
  [example backend here](https://github.com/backstage/backstage/blob/master/packages/backend/src/plugins/catalog.ts).
  We will create a new
  -[`EntityProvider`](https://github.com/backstage/backstage/blob/master/plugins/catalog-backend/src/api/provider.ts)
  +[`EntityProvider`](https://github.com/backstage/backstage/blob/master/plugins/catalog-node/src/api/provider.ts)
  subclass that can be added to this catalog builder.
  Let's make a simple provider that can refresh a set of entities based on a
  @@ -79,7 +79,7 @@ import { Entity } from '@backstage/catalog-model';
  import {
  EntityProvider,
  EntityProviderConnection,
  -} from '@backstage/plugin-catalog-backend';
  +} from '@backstage/plugin-catalog-node';
  /**
  * Provides entities from fictional frobs service.
  @@ -354,7 +354,7 @@ The recommended way of instantiating the catalog backend classes is to use the
  `CatalogBuilder`, as illustrated in the
  [example backend here](https://github.com/backstage/backstage/blob/master/packages/backend/src/plugins/catalog.ts).
  We will create a new
  -[`CatalogProcessor`](https://github.com/backstage/backstage/blob/master/plugins/catalog-backend/src/api/processor.ts)
  +[`CatalogProcessor`](https://github.com/backstage/backstage/blob/master/plugins/catalog-node/src/api/processor.ts)
  subclass that can be added to this catalog builder.
  It is up to you where you put the code for this new processor class. For quick
  @@ -371,7 +371,7 @@ import {
  CatalogProcessor,
  CatalogProcessorEmit,
  LocationSpec,
  -} from '@backstage/plugin-catalog-backend';
  +} from '@backstage/plugin-catalog-node';
  // A processor that reads from the fictional System-X
  export class SystemXReaderProcessor implements CatalogProcessor {
  @@ -455,7 +455,7 @@ import {
  CatalogProcessorCache,
  CatalogProcessorParser,
  LocationSpec,
  -} from '@backstage/plugin-catalog-backend';
  +} from '@backstage/plugin-catalog-node';
  // It's recommended to always bump the CACHE_KEY version if you make
  // changes to the processor implementation or CacheItem.
  