minor doc cleanup: no need to mention Py2.3 any more
minor doc cleanup: no need to mention Py2.3 any more

mrGeen/cython,dahebolangkuan/cython,hickford/cython,mrGeen/cython,fabianrost84/cython,cython/cython,JelleZijlstra/cython,c-blake/cython,roxyboy/cython,dahebolangkuan/cython,c-blake/cython,JelleZijlstra/cython,da-woods/cython,mcanthony/cython,scoder/cython,ChristopherHogan/cython,fperez/cython,acrispin/cython,mrGeen/cython,acrispin/cython,mrGeen/cython,scoder/cython,fabianrost84/cython,c-blake/cython,acrispin/cython,hhsprings/cython,da-woods/cython,slonik-az/cython,scoder/cython,dahebolangkuan/cython,da-woods/cython,acrispin/cython,mcanthony/cython,c-blake/cython,slonik-az/cython,ChristopherHogan/cython,ChristopherHogan/cython,slonik-az/cython,scoder/cython,cython/cython,roxyboy/cython,achernet/cython,fperez/cython,slonik-az/cython,hhsprings/cython,achernet/cython,hickford/cython,achernet/cython,JelleZijlstra/cython,fperez/cython,cython/cython,fabianrost84/cython,mcanthony/cython,JelleZijlstra/cython,hickford/cython,achernet/cython,achernet/cython,cython/cython,hickford/cython,hickford/cython,dahebolangkuan/cython,dahebolangkuan/cython,hhsprings/cython,slonik-az/cython,fabianrost84/cython,roxyboy/cython,mcanthony/cython,hhsprings/cython,JelleZijlstra/cython,roxyboy/cython,hhsprings/cython,da-woods/cython,mcanthony/cython,fabianrost84/cython,fperez/cython,c-blake/cython,fperez/cython,mrGeen/cython,roxyboy/cython,acrispin/cython