Dailymotion bid adapter: Clarify the video metadata to provide in eac…

…h player context

dev-docs/bidders/dailymotion.md

@@ -61,6 +61,32 @@ Please note that failing to set these configuration options will result in the a
 
 # Sample video AdUnit
 
+To allow better targeting, you should provide as much context about the video as possible.
+There are two ways of doing this depending on if you're using Dailymotion player or a third party one.
+
+If you are using the Dailymotion player, you should only provide the video `xid` in your ad unit, example:
+
+```javascript
+const adUnits = [
+  {
+    code: 'test-ad-unit',
+    mediaTypes: {
+      video: {
+        context: 'instream',
+        playerSize: [1280, 720],
+        api: [2,7],
+        xid: 'x123456'
+      },
+    }
+  }
+];
+```
+
+This will automatically fetch the most up-to-date information about the video.
+If you provide any other metadata in addition to the `xid`, they will be ignored.
+
+If you are using a third party video player, you should not provide any `xid` and instead fill the following members:
+
 ```javascript
 const adUnits = [
   {
@@ -79,31 +105,23 @@ const adUnits = [
         tags: 'tag_1,tag_2,tag_3',
         title: 'test video',
         topics: 'topic_1, topic_2',
-        xid: 'x123456'
       },
     },
     bids: [{
       bidder: "dailymotion",
       params: {
         video: {
-          description: 'this is a test video description',
-          duration: 330,
-          iabcat2: ['6', '17'],
-          id: '54321',
-          lang: 'FR',
-          private: false,
-          tags: 'tag_1,tag_2,tag_3',
-          title: 'test video',
-          topics: 'topic_1, topic_2, topic_3',
-          xid: 'x123456'
+          description: 'overriden video description',
+          duration: 330
         }
       }
     }]
   }
 ];
 ```
 
-Following video metadata fields can be added in mediaTypes.video or bids.params.video. If a field exists in both places, it will be overridden by bids.params.video.
+Each of the following video metadata fields can be added in mediaTypes.video or bids.params.video.
+If a field exists in both places, it will be overridden by bids.params.video.
 
 * `description` - Video description
 * `duration` - Video duration in seconds
@@ -114,4 +132,4 @@ Following video metadata fields can be added in mediaTypes.video or bids.params.
 * `tags` - Tags for the video, comma separated
 * `title` - Video title
 * `topics` - Main topics for the video, comma separated
-* `xid` - Dailymotion video identifier (only applicable if using the Dailymotion player), allows better targeting
+* `xid` - Dailymotion video identifier (only applicable if using the Dailymotion player)