Document how to execute a specific test with BUCK

Change-Id: I66199e35ea824af85b877bff94c065da3ad16ab4
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/Documentation/dev-buck.txt b/Documentation/dev-buck.txt
index 5450f57e..78edefd 100644
--- a/Documentation/dev-buck.txt
+++ b/Documentation/dev-buck.txt
@@ -194,6 +194,13 @@
   buck test --all --exclude slow
 ----
 
+To run a specific test, e.g. the acceptance test
+`com.google.gerrit.acceptance.git.HttpPushForReviewIT`:
+
+----
+  buck test //gerrit-acceptance-tests/src/test/java/com/google/gerrit/acceptance/git:HttpPushForReviewIT
+----
+
 
 Dependencies
 ------------