[ci skip] Clarify that modes are strings, not constants

I misunderstood this section the first time I read it. I hope this change will clarify how to request a mode such as from Image.new("RGBA", size)
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MauveRanger 2020-09-09 18:28:49 -04:00 committed by GitHub
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@ -24,7 +24,7 @@ To get the number and names of bands in an image, use the
Modes
-----
The ``mode`` of an image defines the type and depth of a pixel in the image.
The ``mode`` of an image is a string which defines the type and depth of a pixel in the image.
Each pixel uses the full range of the bit depth. So a 1-bit pixel has a range
of 0-1, an 8-bit pixel has a range of 0-255 and so on. The current release
supports the following standard modes: