testlapack: add implementation comments to some tests
Created by: vladimir-ch
In https://github.com/gonum/gonum/pull/465#discussion_r186274052 it was suggested that the clarity of the following LAPACK tests could be improved by adding some implementation comments to them:
-
Dgebd2 -
Dgelqf -
Dgeqp3 -
Dlags2 -
Dlange -
Dlanst -
Dlansy -
Dlapll -
Dlartg -
Dlasr -
Dlatrd -
Dorg2r -
Dorgtr -
Dtrti2 -
Dtrtri -
Dlaln2 -
Dlanv2 -
Dlaqr23 -
Dlarfx -
Dpotf2 -
Dorgbr