SmartAPI: Describe full-text term searching in term-related endpoints

[AlanSimmons]

Issue

Endpoints such as terms/{term_id}/codes indicate exact matches for the term_id path variable; however, if term_id is URL-encoded, the endpoint can handle full text searches.

Example:
https://ontology.api.hubmapconsortium.org/terms/Breast%20cancer/codes

Although the URL-encoding can be seen in the SmartAPI example, it is not clear from the documentation.

Solution

Update the documentation in the ubkg-api and Data Distillery API SmartAPI pages.