Translated
Updated after feedback
Translated
Merge pull request #286 from jcarlosgarcia/using-document-id

Completed translation of "06-Using_a_document_for_id". Resolves #283
Updated after feedback
Merge pull request #284 from jcarlosgarcia/compound-grouping

Completed translation of "05-Compound Grouping" parts a and b. Resolves #282