8215798: [javadoc] Use {@systemProperty} for org.openjdk.java.util.stream.tripwire system property

[Roger Riggs]

Please review using @systemProperty to refer to the 
org.openjdk.java.util.stream.tripwire
system property.

diff --git a/src/java.base/share/classes/java/util/Spliterator.java 
b/src/java.base/share/classes/java/util/Spliterator.java
--- a/src/java.base/share/classes/java/util/Spliterator.java
+++ b/src/java.base/share/classes/java/util/Spliterator.java
@@ -284,7 +284,7 @@ import java.util.function.LongConsumer;
  * }}</pre>
  *
  * @implNote
- * If the boolean system property {@code 
org.openjdk.java.util.stream.tripwire}
+ * If the boolean system property {@systemProperty 
org.openjdk.java.util.stream.tripwire}
  * is set to {@code true} then diagnostic warnings are reported if 
boxing of
  * primitive values occur when operating on primitive subtype 
specializations.
  *

Thanks, Roger