Fixes grammar in introduction

froschdesign · froschdesign · commit 9f390c7f3c9d · 2019-08-14T21:56:57.000+02:00
diff --git a/doc/book/helpers/html-tag.md b/doc/book/helpers/html-tag.md
@@ -1,7 +1,7 @@
 # HtmlTag
 
-The `HtmlTag` helper is used to **create the root of a HTML document**, the open
-and close tags for the `<html>` element.
+The `HtmlTag` helper is used to **create the root of an HTML document**, the
+open and close tags for the `<html>` element.
 
 ## Basic Usage
 
