fix(css): make functions syntax consistent (#817)

css/functions.json

@@ -83,15 +83,15 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/filter-function/contrast"
   },
   "counter()": {
-    "syntax": "counter( <custom-ident>, <counter-style>? )",
+    "syntax": "counter( <counter-name>, <counter-style>? )",
     "groups": [
       "CSS Lists and Counters"
     ],
     "status": "standard",
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/counter"
   },
   "counters()": {
-    "syntax": "counters( <custom-ident>, <string>, <counter-style>? )",
+    "syntax": "counters( <counter-name>, <string>, <counter-style>? )",
     "groups": [
       "CSS Lists and Counters"
     ],
@@ -266,7 +266,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/min"
   },
   "minmax()": {
-    "syntax": "minmax( [ <length> | <percentage> | min-content | max-content | auto ] , [ <length> | <percentage> | <flex> | min-content | max-content | auto ] )",
+    "syntax": "minmax( [ <length-percentage> | min-content | max-content | auto ] , [ <length-percentage> | <flex> | min-content | max-content | auto ] )",
     "groups": [
       "CSS Units",
       "CSS Lengths"
@@ -325,7 +325,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/font-palette/palette-mix"
   },
   "perspective()": {
-    "syntax": "perspective( <length> )",
+    "syntax": "perspective( [ <length [0,∞]> | none ] )",
     "groups": [
       "CSS Transforms"
     ],
@@ -481,7 +481,7 @@
     "mdn_url": "https://developer.mozilla.org/docs/Web/CSS/transform-function/scaleZ"
   },
   "scroll()": {
-    "syntax": "scroll([<axis> || <scroller>]?)",
+    "syntax": "scroll( [ <scroller> || <axis> ]? )",
     "groups": [
       "CSS Animations"
     ],

css/syntaxes.json

@@ -747,7 +747,7 @@
     "syntax": "<selector-list>"
   },
   "scroll()": {
-    "syntax": "scroll( [ <axis> || <scroller> ]? )"
+    "syntax": "scroll( [ <scroller> || <axis> ]? )"
   },
   "scroller": {
     "syntax": "root | nearest | self"