fold private endpoint examples

Author: nmdefries

vignettes/signal-discovery.Rmd

@@ -31,9 +31,9 @@ The site also includes a search tool if you have a keyword (e.g. "Taiwan") in mi
 
 ## Signal metadata
 
-Some endpoints have partner metadata available that, depending on
-the endpoint, provides information about the signals that are available, what
-time ranges they are available for, and when they have been updated.
+Some endpoints have partner metadata available that provides information about
+the signals that are available, for example, what time ranges they are
+available for, and when they have been updated.
 
 ```{r, echo = FALSE}
 suppressMessages(invisible(capture.output(endpts <- avail_endpoints())))
@@ -290,6 +290,10 @@ pub_wiki(language = "en", articles = "influenza", epiweeks = epirange(202001, 20
 These require private access keys to use (separate from the Delphi Epidata API key).
 To actually run these locally, you will need to store these secrets in your `.Reviron` file, or set them as environmental variables.
 
+<details id="private-endpoints">
+
+<summary>Usage of private endpoints</summary>
+
 #### CDC
 
 API docs: <https://cmu-delphi.github.io/delphi-epidata/api/cdc.html>
@@ -372,3 +376,5 @@ pvt_twitter(
   epiweeks = epirange(200301, 202105)
 )
 ```
+
+</details>