feat(vzn-notify): improve installation steps and typing style in API page

Author: SekulDev

pages/vzn-notify.mdx

@@ -13,6 +13,10 @@ Link to buy
 <Steps>
 ### Download the newest version from [Keymaster](https://keymaster.fivem.net/asset-grants)
 
+### Put vzn-notify in your server resources folder
+
+### Add `ensure vzn-notify` to your server.cfg
+
 ### Config
 
 Configure it how do you want

pages/vzn-notify/api.mdx

@@ -40,12 +40,12 @@ exports['vzn-notify']:addNotification(data)
     -   designType?: `1` | `2` | `3` | `4`
         -   the design of the notification [Preview](./designs.mdx)
         -   if not setted -> default from Config
-    -   duration?: number
+    -   duration?: `number`
         -   time during which the notification will be visible (in miliseconds)
         -   if not setted -> default from Config
-    -   title?: string
+    -   title?: `string`
         -   the title of the notification
         -   if not setted -> default from Config
-    -   message: string
+    -   message: `string`
         -   message of the notification
         -   if not setted -> notification will not appear