Update vertical-grid config (#965)

Add `verticalLimit` and `universalLimit` to vertical-grid's page-config.json, and have them commented out as default.

J=SLAP-1618
TEST=none

templates/vertical-grid/page-config.json

@@ -65,6 +65,8 @@
   "verticalsToConfig": {
     "<REPLACE ME>": { // The vertical key from your search configuration
       // "label": "", // The name of the vertical in the section header and the navigation bar
+      // "verticalLimit": 15, // The result count limit for vertical search
+      // "universalLimit": 5, // The result count limit for universal search
       "cardType": "product-prominentimage", // The name of the card to use - e.g. accordion, location, customcard 
       "icon": "star", // The icon to use on the card for this vertical
       "universalSectionTemplate": "standard"