docs: Add missing ')'

BUG=none
TEST=none

Change-Id: I4db43a1b3cca6a75208b8cde7ab07ed0ab96c9dc
Signed-off-by: Dylan Reid <dgreid@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/930477
Reviewed-by: Justin TerAvest <teravest@chromium.org>
diff --git a/docs/user-doc.md b/docs/user-doc.md
index 6709947..5be08f1 100644
--- a/docs/user-doc.md
+++ b/docs/user-doc.md
@@ -332,7 +332,7 @@
 Suites provide a mechanism to group tests together in test groups. They also
 serve as hooks for automated runs of tests verifying various builds. Most
 importantly, that is the BVT (board verification tests) and Smoke (a subset of
-BVT that can run in a VM.
+BVT that can run in a VM).
 
 Please refer to the [suites documentation](https://www.chromium.org/chromium-os/testing/test-suites).