healthcare API: comment why to use streams for DICOM upload (#2122)
healthcare API: comment why to use streams for DICOM upload (#2122)

Co-authored-by: F. Hinkelmann <bfca2660d8321d14063d908366d26ce6f4981952@gmail.com>
GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples,GoogleCloudPlatform/nodejs-docs-samples