Fix 1 ErrorProneStyle finding:

* Non-standard parameter comment; prefer `/* paramName= */ arg`
  (see http://go/bugpattern/ParameterComment)

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#codehealth

Tested:
    Local presubmit tests passed.
PiperOrigin-RevId: 470953422
(cherry picked from commit 52d32be8df)

libraries/test_utils/src/main/java/androidx/media3/test/utils/FakeMediaPeriod.java

@@ -120,7 +120,7 @@ public class FakeMediaPeriod implements MediaPeriod {
         mediaSourceEventDispatcher,
         DrmSessionManager.DRM_UNSUPPORTED,
         new DrmSessionEventListener.EventDispatcher(),
-        /* deferOnPrepared */ false);
+        /* deferOnPrepared= */ false);
   }
 
   /**