Fixed AbstractFilterable#isFiltered javadoc (#3300)

log4j-core/src/main/java/org/apache/logging/log4j/core/filter/AbstractFilterable.java

@@ -145,7 +145,8 @@ public boolean hasFilter() {
     /**
      * Determine if the LogEvent should be processed or ignored.
      * @param event The LogEvent.
-     * @return true if the LogEvent should be processed.
+     * @return {@code true} if the event is filtered and should be ignored; otherwise, {@code false} if
+     *            it should be processed
      */
     @Override
     public boolean isFiltered(final LogEvent event) {

src/changelog/.2.x.x/3300_fix-javadoc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<entry xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+       xmlns="https://logging.apache.org/xml/ns"
+       xsi:schemaLocation="https://logging.apache.org/xml/ns https://logging.apache.org/xml/ns/log4j-changelog-0.xsd"
+       type="fixed">
+  <issue id="3300" link="https://github.com/apache/logging-log4j2/issues/3300"/>
+  <description format="asciidoc">
+    Corrected @return javadoc for AbstractFilterable#isFiltered().
+  </description>
+</entry>