Update jekyll 3.9.0 release post

docs/_posts/2020-08-06-jekyll-3-9-0-released.markdown

@@ -5,8 +5,12 @@ version: 3.9.0
 categories: [release]
 ---
 
-Jekyll 3.9.0 allows use of kramdown v2, the latest series of kramdown. If you choose to upgrade, please note that the GitHub-Flavored Markdown parser and
-the following features from kramdown v1 are now distributed via separate gems. So they will need to be added to your `Gemfile` separately to use the feature:
+Jekyll 3.9.0 allows use of kramdown v2, the latest series of kramdown.
+
+If you choose to upgrade, please note that the GitHub-Flavored Markdown
+parser and other features of kramdown v1 are now distributed via
+separate gems. If you would like to continue using these features, you will
+need to add the gems to your `Gemfile`. They are as follows:
 
 - GFM parser – `kramdown-parser-gfm`
 - coderay syntax highlighter – `kramdown-syntax-coderay`
@@ -16,7 +20,8 @@ the following features from kramdown v1 are now distributed via separate gems. S
 - ritex math engine – `kramdown-math-ritex`
 - itex2mml math engine – `kramdown-math-itex2mml`
 
-Jekyll will require the given gem when the configuration requires it, and will show a helpful message when a dependency is missing.
+Jekyll will require the given gem when the configuration requires it, and
+will show a helpful message when a dependency is missing.
 
 You can check out the patches and see all the details in [the release notes](/docs/history/#v3-9-0)