[components/dom_crawler] 新規翻訳
[components/index] DomCrawlerコンポーネントをindexに追加
Merge pull request #258 from monmonmon/dom_crawler

[components/dom_crawler] 新規翻訳
Merge branch 'master' of https://github.com/symfony-japan/symfony-docs-ja into up-reference-form-type-collection.rst
Merge branch 'up-reference-form-type-collection.rst' of https://github.com/yositani2002/symfony-docs-ja into up-reference-form-type-collection.rst
fix