Update docs variables

docs/_data/variables/elements/title.json

@@ -7,6 +7,11 @@
       "computed_type": "color",
       "computed_value": "hsl(0, 0%, 21%)"
     },
+    "$title-family": {
+      "name": "$title-family",
+      "value": "false",
+      "type": "boolean"
+    },
     "$title-size": {
       "name": "$title-size",
       "value": "$size-3",
@@ -53,6 +58,11 @@
       "computed_type": "color",
       "computed_value": "hsl(0, 0%, 29%)"
     },
+    "$subtitle-family": {
+      "name": "$subtitle-family",
+      "value": "false",
+      "type": "boolean"
+    },
     "$subtitle-size": {
       "name": "$subtitle-size",
       "value": "$size-5",
@@ -94,6 +104,7 @@
   },
   "list": [
     "$title-color",
+    "$title-family",
     "$title-size",
     "$title-weight",
     "$title-line-height",
@@ -102,6 +113,7 @@
     "$title-sub-size",
     "$title-sup-size",
     "$subtitle-color",
+    "$subtitle-family",
     "$subtitle-size",
     "$subtitle-weight",
     "$subtitle-line-height",