DOC: add example of sampling from 2-D array
DOC: add example of sampling from 2-D array

anntzer/numpy,pbrod/numpy,pdebuyl/numpy,simongibbons/numpy,madphysicist/numpy,mattip/numpy,simongibbons/numpy,jakirkham/numpy,anntzer/numpy,numpy/numpy,madphysicist/numpy,madphysicist/numpy,mhvk/numpy,seberg/numpy,numpy/numpy,seberg/numpy,mhvk/numpy,mhvk/numpy,endolith/numpy,jakirkham/numpy,jakirkham/numpy,simongibbons/numpy,anntzer/numpy,rgommers/numpy,endolith/numpy,jakirkham/numpy,simongibbons/numpy,charris/numpy,mattip/numpy,endolith/numpy,pbrod/numpy,seberg/numpy,rgommers/numpy,pdebuyl/numpy,simongibbons/numpy,numpy/numpy,mattip/numpy,rgommers/numpy,mattip/numpy,mhvk/numpy,pbrod/numpy,madphysicist/numpy,seberg/numpy,charris/numpy,mhvk/numpy,charris/numpy,madphysicist/numpy,anntzer/numpy,charris/numpy,pbrod/numpy,pdebuyl/numpy,pbrod/numpy,jakirkham/numpy,endolith/numpy,pdebuyl/numpy,numpy/numpy,rgommers/numpy