docs: include examples using the issues and lag arguments in the “Getting Started” vignette and add references to the versioned data vignette in the versioned data documentation section.

Author: JavierMtzRdz

R/endpoints.R

@@ -40,6 +40,8 @@
 #'   \item \code{lag}: (integer) Retrieve data with a specific lag from
 #'     its issue date.
 #' }
+#' See `vignette("versioned-data")` for details and more ways to specify
+#' versioned data.
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