KRACOEUS-7646: Extended Attributes maint doc does not render properly

Person Extended Attributes maint doc was not rendering properly.  Fixed 2 things:
1)  getCustomDataHelper() method was declared as protected, so JSP was not finding it.
2) getId() was not defined within PersonCustomData class, as the PK was changed from id to personCustomDataId.  So I put in a getId() method to return the personCustomDataId.