Remove references to MGDoFHandler.
Remove references to MGDoFHandler.

MGDoFHandler has been deprecated for a while already. Remove all
references to it from this documentation module.

JaeryunYim/dealii,angelrca/dealii,msteigemann/dealii,nicolacavallini/dealii,sairajat/dealii,sairajat/dealii,lpolster/dealii,angelrca/dealii,sriharisundar/dealii,flow123d/dealii,sriharisundar/dealii,gpitton/dealii,andreamola/dealii,Arezou-gh/dealii,johntfoster/dealii,rrgrove6/dealii,natashasharma/dealii,mtezzele/dealii,danshapero/dealii,angelrca/dealii,rrgrove6/dealii,shakirbsm/dealii,spco/dealii,kalj/dealii,mtezzele/dealii,sriharisundar/dealii,andreamola/dealii,rrgrove6/dealii,YongYang86/dealii,JaeryunYim/dealii,JaeryunYim/dealii,maieneuro/dealii,adamkosik/dealii,shakirbsm/dealii,ESeNonFossiIo/dealii,adamkosik/dealii,johntfoster/dealii,lpolster/dealii,lpolster/dealii,andreamola/dealii,sairajat/dealii,sairajat/dealii,rrgrove6/dealii,lpolster/dealii,naliboff/dealii,angelrca/dealii,sriharisundar/dealii,JaeryunYim/dealii,spco/dealii,lue/dealii,lpolster/dealii,gpitton/dealii,ibkim11/dealii,ibkim11/dealii,pesser/dealii,lpolster/dealii,EGP-CIG-REU/dealii,EGP-CIG-REU/dealii,johntfoster/dealii,shakirbsm/dealii,gpitton/dealii,flow123d/dealii,kalj/dealii,gpitton/dealii,pesser/dealii,sairajat/dealii,sairajat/dealii,YongYang86/dealii,angelrca/dealii,naliboff/dealii,spco/dealii,maieneuro/dealii,angelrca/dealii,kalj/dealii,ESeNonFossiIo/dealii,lue/dealii,sairajat/dealii,natashasharma/dealii,Arezou-gh/dealii,Arezou-gh/dealii,naliboff/dealii,adamkosik/dealii,mtezzele/dealii,danshapero/dealii,natashasharma/dealii,adamkosik/dealii,rrgrove6/dealii,maieneuro/dealii,JaeryunYim/dealii,ibkim11/dealii,lue/dealii,mac-a/dealii,pesser/dealii,gpitton/dealii,YongYang86/dealii,danshapero/dealii,natashasharma/dealii,jperryhouts/dealii,sriharisundar/dealii,jperryhouts/dealii,jperryhouts/dealii,Arezou-gh/dealii,johntfoster/dealii,ESeNonFossiIo/dealii,kalj/dealii,maieneuro/dealii,pesser/dealii,ibkim11/dealii,adamkosik/dealii,nicolacavallini/dealii,JaeryunYim/dealii,msteigemann/dealii,YongYang86/dealii,ESeNonFossiIo/dealii,shakirbsm/dealii,lue/dealii,lue/dealii,spco/dealii,sriharisundar/dealii,nicolacavallini/dealii,nicolacavallini/dealii,natashasharma/dealii,shakirbsm/dealii,Arezou-gh/dealii,mac-a/dealii,mac-a/dealii,maieneuro/dealii,nicolacavallini/dealii,andreamola/dealii,mtezzele/dealii,gpitton/dealii,flow123d/dealii,adamkosik/dealii,Arezou-gh/dealii,naliboff/dealii,nicolacavallini/dealii,danshapero/dealii,jperryhouts/dealii,naliboff/dealii,johntfoster/dealii,EGP-CIG-REU/dealii,EGP-CIG-REU/dealii,johntfoster/dealii,danshapero/dealii,jperryhouts/dealii,naliboff/dealii,spco/dealii,lue/dealii,msteigemann/dealii,ESeNonFossiIo/dealii,sriharisundar/dealii,ibkim11/dealii,ESeNonFossiIo/dealii,EGP-CIG-REU/dealii,Arezou-gh/dealii,JaeryunYim/dealii,pesser/dealii,ibkim11/dealii,andreamola/dealii,pesser/dealii,nicolacavallini/dealii,flow123d/dealii,natashasharma/dealii,andreamola/dealii,danshapero/dealii,lpolster/dealii,natashasharma/dealii,ESeNonFossiIo/dealii,rrgrove6/dealii,andreamola/dealii,msteigemann/dealii,danshapero/dealii,johntfoster/dealii,spco/dealii,msteigemann/dealii,YongYang86/dealii,maieneuro/dealii,flow123d/dealii,YongYang86/dealii,maieneuro/dealii,spco/dealii,ibkim11/dealii,YongYang86/dealii,lue/dealii,mtezzele/dealii,naliboff/dealii,jperryhouts/dealii,jperryhouts/dealii,mac-a/dealii,pesser/dealii,EGP-CIG-REU/dealii,rrgrove6/dealii,msteigemann/dealii,kalj/dealii,mtezzele/dealii,angelrca/dealii,gpitton/dealii,adamkosik/dealii,flow123d/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,shakirbsm/dealii,kalj/dealii,msteigemann/dealii,mac-a/dealii,kalj/dealii,mac-a/dealii,flow123d/dealii,mtezzele/dealii,mac-a/dealii