Fix minor typo in dev-buck.txt

Change-Id: I89cf442baf6bb0fa243c660de4c495e54b6e210b
diff --git a/Documentation/dev-buck.txt b/Documentation/dev-buck.txt
index cc9b32a..f2c4b9e 100644
--- a/Documentation/dev-buck.txt
+++ b/Documentation/dev-buck.txt
@@ -144,7 +144,7 @@
 ----
 
 The type of the repo is induced from the Gerrit version name, i.e.
-* 2.8-SNAPSHOT: shapshot repo
+* 2.8-SNAPSHOT: snapshot repo
 * 2.8: release repo
 
 Plugins