Rename css.types.calc-constant to css.types.calc-keyword (#25395)

* calc-constant renamed to calc-keyword

* calc-constant renamed to calc-keyword

Author: bsmth

css/types/calc-constant.json renamed to css/types/calc-keyword.json

@@ -1,10 +1,11 @@
 {
   "css": {
     "types": {
-      "calc-constant": {
+      "calc-keyword": {
         "__compat": {
-          "description": "`<calc-constant>`",
-          "spec_url": "https://drafts.csswg.org/css-values/#calc-constants",
+          "description": "`<calc-keyword>`",
+          "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/calc-keyword",
+          "spec_url": "https://drafts.csswg.org/css-values/#typedef-calc-keyword",
           "tags": [
             "web-features:calc-constants"
           ],