fix documentation on the axis2 website

The right configuration inside the POM should be for example something like this:
<plugin>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2-wsdl2code-maven-plugin</artifactId>
<version>1.3</version>
<executions>
<execution>
<goals>
<goal>wsdl2code</goal>
</goals>
<configuration>
<packageName>com.your.package</packageName>
<wsdlFile>src/main/wsdl/yourfile.wsdl</wsdlFile>
<databindingName>xmlbeans</databindingName> <!-- or whatever you need -->
</configuration>
</execution>
</executions>
</plugin>

NOT this:

<build>
<plugins>
<plugin>
<groupId>org.apache.axis2.maven2</groupId>
<artifactId>axis2-wsdl2code-maven-plugin</artifactId>
<executions>
<execution>
<goals>
<goal>wsdl2code</goal>
</goals>
</execution>
<configuration>
<packageName>com.foo.myservice</packageName>
</configuration>
</executions>
</plugin>
</plugins>
</build>

In particular configuration belongs inside execution not executions. This is causing a lot of confusion for some people out there...