Bug 24302 – rename the variable "degrees" in sumtype.d at least in the kelvin case

src/phobos/std/sumtype.d ```d struct Fahrenheit { double degrees; } struct Celsius { double degrees; } struct Kelvin { double degrees; } ``` According to WP there is no "degree Kelvin" ("°K") [1]. I would like to suggest renaming "degrees" to "temperature" or "value". The "°" has been dropped 56 (fifty-six) years ago [2]. Also note that the name of the unit is "kelvin" (all lower case). [1] https://en.wikipedia.org/wiki/Kelvin [2] https://www.bipm.org/en/committees/cg/cgpm/13-1967/resolution-3

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