doc: wrap raw hex string in hsl call in CREATE.md

The string must be wrapped as we call `Normal.fg.darken` on it in the next line.

Author: rktjmp

CREATE.md

@@ -98,7 +98,9 @@ return lush(function()
   return {
     -- Define Vim's Normal highlight group.
     -- You can provide values with hsl/hsluv or anything that responds to `tostring`
-    Normal { bg = hsl(208, 90, 30), fg = "#A3CFF5" },
+    -- but be aware if you don't "wrap" your color in a hsl/hsluv call you
+    -- wont have chainable access to the color "operators" (darken, etc).
+    Normal { bg = hsl(208, 90, 30), fg = hsl("#A3CFF5" ) },
 
     -- Make whitespace slightly darker than normal.
     -- you must define Normal before deriving from it.