Clarify the role of out_mask and out_alpha in _make_image. #28130
+4
−6
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The previous comment (initially from 12c27f3) slowly got out of sync with the implementation (e.g. "Agg updates out_alpha in place" doesn't make sense in the local context anymore); rewrite it. attn @tacaswell who wrote that originally (even though I have also mangled that comment in the past).
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