Add block documentation

docs/_data/variables/components/modal.json

@@ -116,6 +116,13 @@
       "name": "$modal-card-body-padding",
       "value": "20px",
       "type": "size"
+    },
+    "$modal-breakpoint": {
+      "name": "$modal-breakpoint",
+      "value": "$tablet",
+      "type": "variable",
+      "computed_type": "size",
+      "computed_value": "769px"
     }
   },
   "list": [
@@ -139,7 +146,8 @@
     "$modal-card-foot-radius",
     "$modal-card-foot-border-top",
     "$modal-card-body-background-color",
-    "$modal-card-body-padding"
+    "$modal-card-body-padding",
+    "$modal-breakpoint"
   ],
   "file_path": "components/modal.sass"
 }