Small clean to SymmetricalLogLocator#14308

Merged

dstansby merged 4 commits intomatplotlib:masterfrom

dstansby:symlog-clean

May 31, 2019

Commits on May 21, 2019

Add more descriptive variable names
dstansby
committed

Commits on May 24, 2019

Add some more comments and use np.abs() to make clear intent
dstansby
committed

Commits on May 27, 2019