Improve deprecation documentation. Closes #7643#7646

Merged

tacaswell merged 3 commits intomatplotlib:masterfrom

data-exp-lab:improve-depr

Dec 20, 2016

Commits on Dec 20, 2016

Tweak the deprecation warning for pyplot.hold
Nathan Goldbaum
committed
Improve the deprecation warning for axes.hold
Nathan Goldbaum
committed
Mention the deprecation of the spectral colormap in the api_changes doc
Nathan Goldbaum
committed