Typo "lables" in doc comment

There's a typo in an API comment.

$ hg diff -R open
diff -r 072f27397b69 src/jdk.compiler/share/classes/com/sun/source/tree/CaseTree.java
--- a/src/jdk.compiler/share/classes/com/sun/source/tree/CaseTree.java Fri Aug 09 12:27:05 2019 -0700
+++ b/src/jdk.compiler/share/classes/com/sun/source/tree/CaseTree.java Fri Aug 09 15:00:41 2019 -0700
@@ -49,7 +49,7 @@
     /**
      * Returns the expression for the case, or
      * {@code null} if this is the default case.
- * If this case has multiple lables, returns the first label.
+ * If this case has multiple labels, returns the first label.
      * @return the expression for the case, or null
      */
     ExpressionTree getExpression();