DOC: Formatting consistency.
DOC: Formatting consistency.

Single back ticks are use for references, so this should be either double
backticks, or quotes. As `'K'` is used later in the same sentence, and
below in the `Notes` section, settle for single quotes.

mattip/numpy,seberg/numpy,charris/numpy,seberg/numpy,charris/numpy,mhvk/numpy,jakirkham/numpy,madphysicist/numpy,rgommers/numpy,pdebuyl/numpy,endolith/numpy,endolith/numpy,simongibbons/numpy,numpy/numpy,madphysicist/numpy,madphysicist/numpy,jakirkham/numpy,numpy/numpy,rgommers/numpy,simongibbons/numpy,anntzer/numpy,seberg/numpy,endolith/numpy,mhvk/numpy,pbrod/numpy,charris/numpy,numpy/numpy,madphysicist/numpy,mattip/numpy,mattip/numpy,pdebuyl/numpy,pdebuyl/numpy,pbrod/numpy,charris/numpy,rgommers/numpy,mattip/numpy,pdebuyl/numpy,jakirkham/numpy,anntzer/numpy,simongibbons/numpy,mhvk/numpy,pbrod/numpy,pbrod/numpy,simongibbons/numpy,rgommers/numpy,madphysicist/numpy,jakirkham/numpy,anntzer/numpy,anntzer/numpy,mhvk/numpy,simongibbons/numpy,jakirkham/numpy,pbrod/numpy,numpy/numpy,mhvk/numpy,seberg/numpy,endolith/numpy