Unbreak gh-pages builds

Fixes:

The variable `{{1, 2, 3}` on line 74 in `bugpattern/ArrayHashCode.md` was not properly closed with `}}`. For more information, see https://help.github.com/articles/page-build-failed-tag-not-properly-terminated/.

MOE_MIGRATED_REVID=160659968

core/src/main/java/com/google/errorprone/bugpatterns/ArrayHashCode.java

@@ -46,7 +46,8 @@
   name = "ArrayHashCode",
   summary = "hashcode method on array does not hash array contents",
   category = JDK,
-  severity = ERROR
+  severity = ERROR,
+  generateExamplesFromTestCases = false
 )
 public class ArrayHashCode extends BugChecker implements MethodInvocationTreeMatcher {