Add missing article

README.md

@@ -66,9 +66,9 @@ Emoji support example:
 
 ## Design
 
-HTML metadata is set automatically. The HTML author is the site author.
-The HTML description is the page description. The HTML keywords is a
-union of the page keywords, tags, and categories.
+The HTML metadata is set automatically. The HTML author is the site
+author. The HTML description is the page description. The HTML keywords
+is a union of the page keywords, tags, and categories.
 
 The HTML title is the page title, followed by a middle dot, followed by
 the site title. If one is missing, the other is used without the middle