tweak wording

Author: yihui

NEWS.md

@@ -1,7 +1,7 @@
 rmarkdown 2.9
 ================================================================================
 
-- All HTML dependencies are now correctly supported, included those with only a `href` url in their `src`. Previously, an unjustified error 'path for html_dependency not provided.' was thrown when rendering documents (thanks, @crazycapivara, @matthewstrasiotto, #1805, #1948, #2151). 
+- All HTML dependencies are now correctly supported, included those with only an `href` component but not `file` component in their `src` attribute. Previously, **rmarkdown** would throw the error `'path for html_dependency not provided'` when rendering documents containing HTML dependencies with `href` components (thanks, @crazycapivara, @matthewstrasiotto, #1805, #1948, #2151).
 
 - Fix an error thrown with output format using a `file_scope` function (like in **bookdown**) (thanks, @rfaelens, #2149).
 

R/html_dependencies.R

@@ -346,7 +346,7 @@ validate_html_dependency <- function(list) {
 
   # check src path or href are given
   if (is.null(list$src)) {
-    stop("neither path nor href are provided for html_dependency", call. = FALSE)
+    stop("src for html_dependency not provided", call. = FALSE)
   }
   if (!is.null(list$src$file)) {
     file <- list$src$file