add link from TitledClass to Doc

...upelec.edf.riseclipse.iec61850.nsd.edit/plugin.properties

...edf/riseclipse/iec61850/nsd/provider/DocItemProvider.java

...se/iec61850/nsd/provider/DocumentedClassItemProvider.java

...clipse/iec61850/nsd/provider/TitledClassItemProvider.java

...ntralesupelec.edf.riseclipse.iec61850.nsd/model/nsd.ecore

...alesupelec.edf.riseclipse.iec61850.nsd/model/nsd.genmodel

...c/fr/centralesupelec/edf/riseclipse/iec61850/nsd/Doc.java

...esupelec/edf/riseclipse/iec61850/nsd/DocumentedClass.java

...ntralesupelec/edf/riseclipse/iec61850/nsd/NsdPackage.java

...tralesupelec/edf/riseclipse/iec61850/nsd/TitledClass.java

...ec/edf/riseclipse/iec61850/nsd/impl/AbbreviationImpl.java

...iseclipse/iec61850/nsd/impl/ConstructedAttributeImpl.java

...ralesupelec/edf/riseclipse/iec61850/nsd/impl/DocImpl.java

...edf/riseclipse/iec61850/nsd/impl/DocumentedClassImpl.java

...supelec/edf/riseclipse/iec61850/nsd/impl/LNClassImpl.java

...elec/edf/riseclipse/iec61850/nsd/impl/NsdPackageImpl.java

...lec/edf/riseclipse/iec61850/nsd/impl/TitledClassImpl.java