review: Fix typo in help text

Change-Id: Ia60603f2659b87f0c4194849002fca7181cc4004
Reviewed-on: https://go-review.googlesource.com/1190
Reviewed-by: Andrew Gerrand <adg@golang.org>
diff --git a/git-review/review.go b/git-review/review.go
index efedddd..4e7f347 100644
--- a/git-review/review.go
+++ b/git-review/review.go
@@ -47,7 +47,7 @@
 The review command is a wrapper for the git command that provides a simple
 interface to the "single-commit feature branch" development model.
 
-Available comands:
+Available commands:
 
 	change [name]
 		Create a change commit, or amend an existing change commit,