Added description of "allow_no_delete" in migrations

[mnocon]

Doc for https://github.com/ibexa/migrations/pull/400 (and a bit for https://github.com/ibexa/migrations/pull/341 , because it was in the example)

Target: 4.6, 5.0

[github-actions]

Preview of modified files

Preview of modified Markdown:

• docs/content_management/data_migration/importing_data.md

[github-actions]

code_samples/ change report

Before (on target branch)	After (in current PR)
code_samples/data_migration/examples/delete_content.yaml	code_samples/data_migration/examples/delete_content.yaml
	docs/content_management/data_migration/importing_data.md@247:``` yaml docs/content_management/data_migration/importing_data.md@248:[[= include_file('code_samples/data_migration/examples/delete_content.yaml') =]] docs/content_management/data_migration/importing_data.md@249:``` 001⫶- 002⫶ type: content 003⫶ mode: delete 004⫶ match: 005⫶ field: content_remote_id 006⫶ value: __REMOTE_ID__ 007⫶ only_visible_content: true # Optional, default: true. If set to true, only visible content will be deleted. 008⫶ allow_no_delete: false # Optional, default: false. If set to true, the migration will not fail if no content is found using the specified criteria.

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