Updates to data licensing / terms language

Author: krivard

docs/api/README.md

@@ -37,17 +37,15 @@ like to cite it, we would gratefully recommend the following copy:
 
 ## Data licensing
 
-The majority of the data surfaced through this API is more or less just a
-carefully curated mirror of data acquired from various external parties. Such
-data is subject to its original licensing, where applicable.
-
----
+Several datasets surfaced through this API are carefully curated mirrors of data
+acquired from various external parties. Such data is subject to its original
+licensing, where applicable.
 
 Any data which is produced novelly by Delphi and is intentionally and openly
 surfaced by Delphi through this API is hereby licensed
-[CC-BY](https://creativecommons.org/licenses/by/4.0/). Endpoints, as specified
-by the `source` parameter, which are known to wholly or partially serve data
-under this license include:
+[CC-BY](https://creativecommons.org/licenses/by/4.0/) except where otherwise
+noted. Endpoints, as specified by the `source` parameter, which are known to
+wholly or partially serve data under this license include:
 
 - `covidcast`
 - `covidcast_meta`

docs/api/covidcast.md

@@ -17,7 +17,7 @@ partners. The API allows users to select specific signals and download data for
 selected geographical areas---counties, states, metropolitan statistical areas,
 and other divisions.
 
-This data is freely available under our [licensing](README.md#data-licensing)
+*Licensing*: This data is freely available under our [licensing](README.md#data-licensing)
 terms; we encourage academic users to [cite](README.md#citing) the data if they
 use it in any publications. Our [data ingestion
 code](https://github.com/cmu-delphi/covidcast-indicators) and [API server