other endpoints intro

Author: nmdefries

docs/api/README.md

@@ -4,11 +4,12 @@ nav_order: 3
 has_children: true
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-# Epidata API (Other Diseases)
+# Other Endpoints (COVID-19 and Other Diseases)
 
 This is the home of [Delphi](https://delphi.cmu.edu/)'s epidemiological data
 API for tracking epidemics such as influenza, dengue, and norovirus. Note that
-our work on COVID-19 is described in the [COVIDcast Epidata API documentation](covidcast.md).
+additional data, especially related to COVID-19, is available in the
+[main Epidata API (formerly known as COVIDcast)](covidcast.md).
 
 ## Table of Contents
 {: .no_toc .text-delta}