Trivial javadoc fix of j.l.i.MethodHandles::arrayElementVarHandle

See https://mail.openjdk.java.net/pipermail/core-libs-dev/2020-April/066015.html

diff -r 70c2239696ae src/java.base/share/classes/java/lang/invoke/MethodHandles.java
--- a/src/java.base/share/classes/java/lang/invoke/MethodHandles.java Fri Apr 24 16:12:53 2020 +0530
+++ b/src/java.base/share/classes/java/lang/invoke/MethodHandles.java Fri Apr 24 14:08:46 2020 +0200
@@ -3960,7 +3960,7 @@
      * {@code short}, {@code char}, {@code int}, {@code long},
      * {@code float}, or {@code double} then numeric atomic update access
      * modes are unsupported.
- * <li>if the field type is anything other than {@code boolean},
+ * <li>if the component type is anything other than {@code boolean},
      * {@code byte}, {@code short}, {@code char}, {@code int} or
      * {@code long} then bitwise atomic update access modes are
      * unsupported.