8325001: Typo in the javadocs for the Arena::ofShared method

Reviewed-by: mcimadamore
Backport-of: 6b84f9bb3ee4362bf9daa4fb3905b168f9035336

src/java.base/share/classes/java/lang/foreign/Arena.java

@@ -258,7 +258,7 @@ static Arena ofConfined() {
     }
 
     /**
-     * {@return a new shared arena} Segments allocated with the global arena can be
+     * {@return a new shared arena} Segments allocated with the shared arena can be
      *          {@linkplain MemorySegment#isAccessibleBy(Thread) accessed} by any thread.
      * <p>
      * Memory segments {@linkplain #allocate(long, long) allocated} by the returned arena