build.md: Remove reference to non-existin tests

Change-Id: Ia69ac97d4d2e3542dcb261acf9c3b731a1a627ef

src/main/resources/Documentation/build.md

diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index 2fbc172..1964148 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -27,11 +27,5 @@
   ./tools/eclipse/project.py
 ```
 
-To execute the tests run:
-
-```
-  bazel test plugins/@PLUGIN@:websession_flatfile_tests
-```
-
 How to build the Gerrit Plugin API is described in the [Gerrit
 documentation](../../../Documentation/dev-bazel.html#_extension_and_plugin_api_jar_files).