message: docs: replace `defaultCollection` with `schematicCollections`
  `defaultCollection` has deprecated in favor of `schematicCollections`.
  Related to
  PR Close
diff: @@ -49,11 +49,11 @@ For more information, see [Workspace and project file structure](guide/file-stru
  The following configuration properties are a set of options that customize the Angular CLI.
  | Property | Description | Value Type |
  -| :------------------ | :----------------------------------------------------------------------------------------------- | :------------------------------------------------------- |
  +| :--------------------- | :----------------------------------------------------------------------------------------------- | :------------------------------------------------------- |
  | `analytics` | Share anonymous [usage data](cli/usage-analytics-gathering) with the Angular Team. | `boolean` \| `ci` |
  | `analyticsSharing` | A set of analytics sharing options. | [Analytics sharing options](#analytics-sharing-options) |
  | `cache` | Control [persistent disk cache](cli/cache) used by [Angular CLI Builders](guide/cli-builder). | [Cache options](#cache-options) |
  -| `defaultCollection` | The default schematics collection to use. | `string` |
  +| `schematicCollections` | A list of schematics collections to use. | `string[]` |
  | `packageManager` | The preferred package manager tool to use. | `npm` \| `cnpm` \| `pnpm` \| `yarn` |
  | `warnings` | Control CLI specific console warnings. | [Warnings options](#warnings-options) |
  