Docs: fix condition in pivotal .ditaval

gpdb-doc/dita/gpdb-webhelp.ditaval

@@ -4,7 +4,7 @@
 	<prop att="otherprops" val="op-help" action="include"/>
 	<prop att="otherprops" val="op-hidden" action="exclude"/>
 	<prop att="otherprops" val="op-print" action="exclude"/>
-	<prop att="otherprops" val="pivotal" action="exclude"/>
+	<prop att="otherprops" val="pivotal" action="include"/>
 	<prop att="otherprops" val="oss-only" action="exclude"/>
 	<prop att="otherprops" val="gpdb" action="include"/>
 </val>