ChangeInputProtoConverterTest: qualify class name linked in javadoc

Release-Notes: skip
Change-Id: I5dbfa304bd3a0e27e71a3cda4dd25d18fd915c1c
diff --git a/javatests/com/google/gerrit/entities/converter/ChangeInputProtoConverterTest.java b/javatests/com/google/gerrit/entities/converter/ChangeInputProtoConverterTest.java
index 53a2f11..ffa99d9 100644
--- a/javatests/com/google/gerrit/entities/converter/ChangeInputProtoConverterTest.java
+++ b/javatests/com/google/gerrit/entities/converter/ChangeInputProtoConverterTest.java
@@ -240,7 +240,10 @@
     assertChangeInputEquals(changeInput, convertedChangeInput);
   }
 
-  /** See {@link SerializedClassSubject} for background and what to do if this test fails. */
+  /**
+   * See {@link com.google.gerrit.proto.testing.SerializedClassSubject} for background and what to
+   * do if this test fails.
+   */
   @Test
   public void methodsExistAsExpected() {
     assertThatSerializedClass(ChangeInput.class)