[Javadoc] Clarify behavior of deprecated

CSVFormat#withFirstRecordAsHeader() #2413.

Author: garydgregory

src/changes/changes.xml

@@ -45,6 +45,7 @@
       <action type="fix" issue="CSV-320" dev="aherbert" due-to="Jan Burkhardt">Remove Spotbugs dependency and use exclude-filter instead #564.</action>
       <action type="fix" dev="ggregory" due-to="Cassio Santos">Remove broken website link #577.</action>
       <action type="fix" dev="ggregory" due-to="Gary Gregory">Fix Apache RAT plugin console warnings.</action>
+      <action type="fix" dev="ggregory" due-to="Indy, Gary Gregory">[Javadoc] Clarify behavior of deprecated CSVFormat#withFirstRecordAsHeader() #2413.</action>
       <!-- ADD -->
       <action type="add" dev="ggregory" due-to="Gary Gregory, Indy, Sylvia van Os" issue="CSV-307">Add an "Android Compatibility" section to the web site.</action>
       <!-- UPDATE -->