Change spec description from 'Temperature' to 'Length'

Author: AliceRixte

test/Data/Units/NonStd/LengthSpec.hs

@@ -9,7 +9,7 @@ import Data.Units.Base.ConvertProp
 
 spec :: Spec
 spec = do
-  describe "Temperature" $ do
+  describe "Length" $ do
     toFromSpec @Foot    @Double
     fromToAssert @Double (Meter 1) (Foot 3.2808333333333333)
     fromToAssert @Double (Foot 1) (Meter 0.3048006096012192)