Improve docs for distribute_sparsity_pattern.
Improve docs for distribute_sparsity_pattern.

sairajat/dealii,spco/dealii,kalj/dealii,pesser/dealii,maieneuro/dealii,jperryhouts/dealii,danshapero/dealii,pesser/dealii,andreamola/dealii,maieneuro/dealii,kalj/dealii,ESeNonFossiIo/dealii,Arezou-gh/dealii,andreamola/dealii,JaeryunYim/dealii,angelrca/dealii,sairajat/dealii,ESeNonFossiIo/dealii,gpitton/dealii,maieneuro/dealii,shakirbsm/dealii,gpitton/dealii,kalj/dealii,angelrca/dealii,naliboff/dealii,maieneuro/dealii,kalj/dealii,Arezou-gh/dealii,JaeryunYim/dealii,Arezou-gh/dealii,angelrca/dealii,danshapero/dealii,jperryhouts/dealii,nicolacavallini/dealii,angelrca/dealii,gpitton/dealii,naliboff/dealii,gpitton/dealii,sairajat/dealii,nicolacavallini/dealii,spco/dealii,Arezou-gh/dealii,danshapero/dealii,naliboff/dealii,spco/dealii,pesser/dealii,jperryhouts/dealii,jperryhouts/dealii,nicolacavallini/dealii,sairajat/dealii,JaeryunYim/dealii,nicolacavallini/dealii,nicolacavallini/dealii,JaeryunYim/dealii,shakirbsm/dealii,sairajat/dealii,naliboff/dealii,pesser/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,andreamola/dealii,danshapero/dealii,ESeNonFossiIo/dealii,spco/dealii,maieneuro/dealii,jperryhouts/dealii,jperryhouts/dealii,Arezou-gh/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,shakirbsm/dealii,ESeNonFossiIo/dealii,nicolacavallini/dealii,EGP-CIG-REU/dealii,jperryhouts/dealii,kalj/dealii,gpitton/dealii,danshapero/dealii,andreamola/dealii,sairajat/dealii,andreamola/dealii,ESeNonFossiIo/dealii,EGP-CIG-REU/dealii,naliboff/dealii,kalj/dealii,naliboff/dealii,angelrca/dealii,ESeNonFossiIo/dealii,maieneuro/dealii,angelrca/dealii,pesser/dealii,pesser/dealii,angelrca/dealii,EGP-CIG-REU/dealii,EGP-CIG-REU/dealii,andreamola/dealii,gpitton/dealii,Arezou-gh/dealii,JaeryunYim/dealii,spco/dealii,spco/dealii,shakirbsm/dealii,JaeryunYim/dealii,spco/dealii,maieneuro/dealii,JaeryunYim/dealii,shakirbsm/dealii,EGP-CIG-REU/dealii,EGP-CIG-REU/dealii,gpitton/dealii,andreamola/dealii,sairajat/dealii,Arezou-gh/dealii,kalj/dealii,danshapero/dealii,shakirbsm/dealii,naliboff/dealii,danshapero/dealii,pesser/dealii