DOC: removes broken docstring example (source code, png, pdf) links
DOC: removes broken docstring example (source code, png, pdf) links

Currently the (source code, png, pdf) links for docstring examples
are pointing to missing files and give 404 errors (see issue #9500).
This commit removes those links by modifying doc/source/conf.py.

rgommers/numpy,pdebuyl/numpy,shoyer/numpy,charris/numpy,rgommers/numpy,jorisvandenbossche/numpy,grlee77/numpy,madphysicist/numpy,pdebuyl/numpy,pizzathief/numpy,Eric89GXL/numpy,jakirkham/numpy,pbrod/numpy,WarrenWeckesser/numpy,abalkin/numpy,jorisvandenbossche/numpy,gfyoung/numpy,WarrenWeckesser/numpy,gfyoung/numpy,shoyer/numpy,pizzathief/numpy,ahaldane/numpy,mhvk/numpy,pbrod/numpy,jakirkham/numpy,seberg/numpy,ahaldane/numpy,seberg/numpy,Eric89GXL/numpy,anntzer/numpy,MSeifert04/numpy,simongibbons/numpy,anntzer/numpy,shoyer/numpy,grlee77/numpy,ahaldane/numpy,tynn/numpy,charris/numpy,mattip/numpy,jakirkham/numpy,charris/numpy,mattip/numpy,anntzer/numpy,madphysicist/numpy,pdebuyl/numpy,simongibbons/numpy,pizzathief/numpy,pbrod/numpy,pizzathief/numpy,seberg/numpy,simongibbons/numpy,endolith/numpy,jakirkham/numpy,solarjoe/numpy,endolith/numpy,MSeifert04/numpy,madphysicist/numpy,endolith/numpy,MSeifert04/numpy,simongibbons/numpy,WarrenWeckesser/numpy,endolith/numpy,madphysicist/numpy,Eric89GXL/numpy,ahaldane/numpy,solarjoe/numpy,shoyer/numpy,Eric89GXL/numpy,grlee77/numpy,grlee77/numpy,WarrenWeckesser/numpy,jorisvandenbossche/numpy,MSeifert04/numpy,mhvk/numpy,pizzathief/numpy,solarjoe/numpy,jorisvandenbossche/numpy,rgommers/numpy,mhvk/numpy,MSeifert04/numpy,pbrod/numpy,b-carter/numpy,gfyoung/numpy,pbrod/numpy,numpy/numpy,abalkin/numpy,mhvk/numpy,abalkin/numpy,b-carter/numpy,WarrenWeckesser/numpy,shoyer/numpy,jakirkham/numpy,numpy/numpy,charris/numpy,mhvk/numpy,tynn/numpy,simongibbons/numpy,seberg/numpy,numpy/numpy,ahaldane/numpy,rgommers/numpy,pdebuyl/numpy,b-carter/numpy,jorisvandenbossche/numpy,mattip/numpy,mattip/numpy,grlee77/numpy,anntzer/numpy,madphysicist/numpy,numpy/numpy,tynn/numpy