Fix missing argument to --enable_display

`--enable_display` needs a value, and fails if passed just as-is.

Closes #14042.

PiperOrigin-RevId: 399495280
diff --git a/site/docs/android-instrumentation-test.md b/site/docs/android-instrumentation-test.md
index 34a6226..8489685 100644
--- a/site/docs/android-instrumentation-test.md
+++ b/site/docs/android-instrumentation-test.md
@@ -329,7 +329,7 @@
 these test arguments to Bazel:
 
 ```
-bazel test //my/test:target --test_arg=--enable_display --test_env=DISPLAY
+bazel test //my/test:target --test_arg=--enable_display=true --test_env=DISPLAY
 ```
 
 ### Testing with a local emulator or device