blog: fix typo in the using-go-modules post

Change-Id: Id17835be6a01d4a7c29d25b670f830eb089808d5
Reviewed-on: https://go-review.googlesource.com/c/blog/+/168617
Reviewed-by: Cassandra Salisbury <cls@golang.org>
diff --git a/content/using-go-modules.article b/content/using-go-modules.article
index 24ed2c9..d93842e 100644
--- a/content/using-go-modules.article
+++ b/content/using-go-modules.article
@@ -14,7 +14,7 @@
 [[https://blog.golang.org/versioning-proposal][new dependency management system]]
 that makes dependency version information explicit
 and easier to manage.
-This blog post is a tutorial to introduction to the basic operations needed
+This blog post is an introduction to the basic operations needed
 to get started using modules.
 A followup post will cover releasing modules for others to use.