fix(QSlider/QRange): small fixes for json (quasarframework#11815)

Author: pdanpdan

ui/src/components/range/QRange.json

@@ -46,7 +46,8 @@
     "left-label-text-color": {
       "extends": "color",
       "desc": "Color name for left label text from the Quasar Color Palette",
-      "category": "labels"
+      "category": "labels",
+      "addedIn": "v1.1.0"
     },
 
     "right-label-color": {
@@ -58,7 +59,8 @@
     "right-label-text-color": {
       "extends": "color",
       "desc": "Color name for right label text from the Quasar Color Palette",
-      "category": "labels"
+      "category": "labels",
+      "addedIn": "v1.1.0"
     },
 
     "left-label-value": {

ui/src/components/slider/slider-utils.json

@@ -291,7 +291,7 @@
 
   "scopedSlots": {
     "marker-label": {
-      "desc": "What should the menu display after filtering options and none are left to be displayed; Suggestion: <div>",
+      "desc": "What to be used to display the marker label",
       "addedIn": "v1.17",
       "scope": {
         "marker": {
@@ -424,7 +424,7 @@
     },
 
     "marker-label-group": {
-      "desc": "What should the menu display after filtering options and none are left to be displayed; Suggestion: <div>",
+      "desc": "What to be used to display the marker label group",
       "addedIn": "v1.17",
       "scope": {
         "markerList": {