Backport PR #12209 on branch v3.0.0-doc (Doc: Sort named colors example by palette) - #12251

Backport PR #12209 on branch v3.0.0-doc (Doc: Sort named colors example by palette)#12251

tacaswell merged 1 commit into

matplotlib:v3.0.0-docmatplotlib/matplotlib:v3.0.0-docfrom

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