A Note refers to the main clinical note Heidi generates as a summary of the transcribed session, typically the one that would go into your health record (i.e. File/PMS/EMR/EHR) and is intended for other clinicians to read as a record of your care.
A Document is a file that you can create in addition to the Note, such as a discharge summary, medical certificate, referral letter or a patient handout. Documents are created based on the Note summary and any information added in 'Context'. Therefore, it’s best to make sure you are happy with your note before creating any documents.