Added example for signal.impulse, copied from impulse2
Added example for signal.impulse, copied from impulse2

nmayorov/scipy,jamestwebber/scipy,arokem/scipy,person142/scipy,Stefan-Endres/scipy,e-q/scipy,person142/scipy,rgommers/scipy,zerothi/scipy,jor-/scipy,tylerjereddy/scipy,gertingold/scipy,grlee77/scipy,WarrenWeckesser/scipy,anntzer/scipy,arokem/scipy,arokem/scipy,Eric89GXL/scipy,perimosocordiae/scipy,Eric89GXL/scipy,tylerjereddy/scipy,matthew-brett/scipy,scipy/scipy,e-q/scipy,jamestwebber/scipy,ilayn/scipy,rgommers/scipy,gertingold/scipy,ilayn/scipy,WarrenWeckesser/scipy,rgommers/scipy,jor-/scipy,WarrenWeckesser/scipy,aeklant/scipy,endolith/scipy,nmayorov/scipy,aeklant/scipy,vigna/scipy,arokem/scipy,nmayorov/scipy,andyfaff/scipy,matthew-brett/scipy,jor-/scipy,andyfaff/scipy,Stefan-Endres/scipy,Stefan-Endres/scipy,pizzathief/scipy,scipy/scipy,aarchiba/scipy,e-q/scipy,matthew-brett/scipy,lhilt/scipy,person142/scipy,Eric89GXL/scipy,lhilt/scipy,pizzathief/scipy,aarchiba/scipy,endolith/scipy,vigna/scipy,WarrenWeckesser/scipy,aeklant/scipy,andyfaff/scipy,zerothi/scipy,pizzathief/scipy,perimosocordiae/scipy,WarrenWeckesser/scipy,perimosocordiae/scipy,aarchiba/scipy,rgommers/scipy,jamestwebber/scipy,pizzathief/scipy,aarchiba/scipy,mdhaber/scipy,perimosocordiae/scipy,nmayorov/scipy,vigna/scipy,grlee77/scipy,zerothi/scipy,person142/scipy,Eric89GXL/scipy,gertingold/scipy,tylerjereddy/scipy,anntzer/scipy,endolith/scipy,scipy/scipy,mdhaber/scipy,nmayorov/scipy,endolith/scipy,pizzathief/scipy,andyfaff/scipy,grlee77/scipy,Stefan-Endres/scipy,rgommers/scipy,mdhaber/scipy,Eric89GXL/scipy,zerothi/scipy,anntzer/scipy,andyfaff/scipy,aeklant/scipy,scipy/scipy,e-q/scipy,lhilt/scipy,jamestwebber/scipy,tylerjereddy/scipy,Stefan-Endres/scipy,anntzer/scipy,andyfaff/scipy,mdhaber/scipy,mdhaber/scipy,perimosocordiae/scipy,grlee77/scipy,mdhaber/scipy,WarrenWeckesser/scipy,endolith/scipy,Stefan-Endres/scipy,lhilt/scipy,jamestwebber/scipy,matthew-brett/scipy,lhilt/scipy,endolith/scipy,jor-/scipy,anntzer/scipy,gertingold/scipy,aarchiba/scipy,grlee77/scipy,ilayn/scipy,matthew-brett/scipy,zerothi/scipy,scipy/scipy,person142/scipy,perimosocordiae/scipy,ilayn/scipy,jor-/scipy,zerothi/scipy,vigna/scipy,aeklant/scipy,e-q/scipy,anntzer/scipy,scipy/scipy,ilayn/scipy,vigna/scipy,tylerjereddy/scipy,gertingold/scipy,arokem/scipy,ilayn/scipy,Eric89GXL/scipy