Correct additivity option usage in property file documentation (#528)

Author: swebb2066

src/site/markdown/concepts.md

@@ -492,7 +492,7 @@ This can be done:
 Logger::getLogger("MyLogger")->setAdditivity(false);</pre>
 - in [a properties configuration file] using
 <pre>log4j.logger.MyLogger=debug
-log4j.logger.MyLogger.additivity=false</pre>
+log4j.additivity.MyLogger=false</pre>
 - in [an XML configuration file] using
 <pre>\<logger name="MyLogger" >
    \<priority value="debug"/>

src/site/markdown/configuration-samples.md

@@ -139,7 +139,7 @@ log4j.appender.csvData.layout=org.apache.log4j.PatternLayout
 log4j.appender.csvData.layout.ConversionPattern=%m,%d{yyyy-MM-dd,HH:mm,ss.SSS}%n
 
 #log4j.logger.csv.URCommunicationPort=DEBUG, csvData
-#log4j.logger.csv.URCommunicationPort.additivity=false
+#log4j.additivity.csv.URCommunicationPort=false
 
 # UnitTests
 #log4j.logger.MockArmTests=DEBUG