DOC: Fixups and brief "weakly typed arrays" discussion/alternative
DOC: Fixups and brief "weakly typed arrays" discussion/alternative

Based on Tylers and Jake Vanderplas' comments.

mhvk/numpy,charris/numpy,pdebuyl/numpy,mhvk/numpy,mattip/numpy,numpy/numpy,anntzer/numpy,endolith/numpy,numpy/numpy,mhvk/numpy,mattip/numpy,anntzer/numpy,mattip/numpy,numpy/numpy,numpy/numpy,pdebuyl/numpy,pdebuyl/numpy,rgommers/numpy,charris/numpy,anntzer/numpy,rgommers/numpy,endolith/numpy,rgommers/numpy,pdebuyl/numpy,mattip/numpy,rgommers/numpy,mhvk/numpy,endolith/numpy,anntzer/numpy,mhvk/numpy,charris/numpy,endolith/numpy,charris/numpy