Documentation: Add missing alternative for plugin in-tree testing

Bug: Issue 12096
Change-Id: Ibc0ac38e849ee51f8212d63002e0b2e05a7d9cf3
diff --git a/src/main/resources/Documentation/build.md b/src/main/resources/Documentation/build.md
index a41015d..1fdbc2a 100644
--- a/src/main/resources/Documentation/build.md
+++ b/src/main/resources/Documentation/build.md
@@ -79,13 +79,13 @@
   ./tools/eclipse/project.py
 ```
 
-To execute the tests run:
+To execute the tests run either one of:
 
 ```
   bazel test --test_tag_filters=@PLUGIN@ //...
+  bazel test plugins/@PLUGIN@:@PLUGIN@_tests
 ```
 
-
 [Back to @PLUGIN@ documentation index][index]
 
 [index]: index.html