Add period and re-document()

Author: jennybc

R/ui-legacy.R

@@ -14,7 +14,7 @@
 #'   usethis itself now uses cli internally for its UI, but these new functions
 #'   are not exported and presumably never will be. There is a developer-focused
 #'   article on the process of transitioning usethis's own UI to use cli:
-#'   [Converting usethis's UI to use cli](https://usethis.r-lib.org/articles/ui-cli-conversion.html)
+#'   [Converting usethis's UI to use cli](https://usethis.r-lib.org/articles/ui-cli-conversion.html).
 
 #' @details
 #'