Update release notes, refs #3191

docs/pages/7_0_0_release_notes.md

@@ -154,6 +154,7 @@ The following previously deprecated rules have been finally removed:
     * [#2532](https://github.com/pmd/pmd/issues/2532): \[java] AvoidDecimalLiteralsInBigDecimalConstructor can not detect the case new BigDecimal(Expression)
     * [#2716](https://github.com/pmd/pmd/issues/2716): \[java] CompareObjectsWithEqualsRule: False positive with Enums
     * [#2880](https://github.com/pmd/pmd/issues/2880): \[java] CompareObjectsWithEquals - false negative with type res
+    * [#3071](https://github.com/pmd/pmd/issues/3071): \[java] BrokenNullCheck FP with PMD 6.30.0
 * java-multithreading
     * [#2537](https://github.com/pmd/pmd/issues/2537): \[java] DontCallThreadRun can't detect the case that call run() in `this.run()`
     * [#2538](https://github.com/pmd/pmd/issues/2538): \[java] DontCallThreadRun can't detect the case that call run() in `foo.bar.run()`