Repetitive CSS function data between functions.json and syntaxes.json

[skyclouds2001]

What information was incorrect, unhelpful, or incomplete?

many CSS function data are repetitive represented the functions.json file and syntaxes.json file, this may cause inconsistent and hard to maintain

for example:

data/css/functions.json

Lines 18 to 25 in d572bcb

	"attr()": {
	"syntax": "attr( <attr-name> <type-or-unit>? [, <attr-fallback> ]? )",
	"groups": [
	"CSS Generated Content"
	],
	"status": "standard",
	"mdn_url": "https://developer.mozilla.org/docs/Web/CSS/attr"
	},

and

data/css/syntaxes.json

Lines 44 to 46 in d572bcb

	"attr()": {
	"syntax": "attr( <attr-name> <type-or-unit>? [, <attr-fallback> ]? )"
	},

What did you expect to see?

only keep CSS function data in functions.json

Do you have any supporting links, references, or citations?

No response

Do you have anything more you want to share?

note the change may cause break change though

maybe should listen to other's opinions