fix: Names and clarification

[seebees]

The encyrption context on hierarchical materials is all the encryption context, not only any custom values set by the customer on branch key creation.

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

Check any applicable:

• [ ] Were any files moved? Moving files changes their URL, which breaks all hyperlinks to the files.