fix clone command in tutorial document

Change-Id: Idf88bcdf970deacfd5e4226568b00624b0f13db4
diff --git a/Documentation/intro-gerrit-walkthrough.txt b/Documentation/intro-gerrit-walkthrough.txt
index 1fba1dc..b4f799c2 100644
--- a/Documentation/intro-gerrit-walkthrough.txt
+++ b/Documentation/intro-gerrit-walkthrough.txt
@@ -28,7 +28,7 @@
 modify. To get this code, he runs the following `git clone` command:
 
 ----
-clone ssh://gerrithost:29418/RecipeBook.git RecipeBook
+git clone ssh://gerrithost:29418/RecipeBook.git RecipeBook
 ----
 
 After he clones the repository, he runs a couple of commands to add a