DOC: Simplify terminology
DOC: Simplify terminology

For some reason this file insisted on using multiple redundant terms
for array dimensionality, and in particular liked the word "rank",
which is confusing and very rarely used in my experience. This commit
drops the word rank and removes a number of parenthetical "X (which is
to say Y)" phrasings.

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