Update plugin docs report visualizations

docs/plugins/max-scroll-tracker.md

@@ -8,10 +8,14 @@ For each page on your site, the `maxScrollTracker` plugin tracks how far down th
 
 The max scroll percentage amounts are calculated on a per-session basis, which means that once a user has scrolled to 100% for a particular page, tracking for that page stops and will only resume when a new session starts.
 
-The following sample reports show how you can use the `maxScrollTracker` plugin to more accurately measure user engagement with your content.
+The following example reports show how you can use the `maxScrollTracker` plugin to more accurately measure user engagement with your content:
+
+**Top pages by scroll depth:**
 
 ![max-scroll-page](https://cloud.githubusercontent.com/assets/326742/22574480/e630a590-e963-11e6-9c3d-a201d44aa177.png)
 
+**Traffic origins (source/medium) resulting in the highest scroll engagement:**
+
 ![max-scroll-source-medium](https://cloud.githubusercontent.com/assets/326742/22574481/e634ef24-e963-11e6-8017-5f6df1d6c55c.png)
 
 ### How it works
@@ -20,6 +24,8 @@ The `maxScrollTracker` plugin listens for [`scroll`](https://developer.mozilla.o
 
 Tracking the scroll depth as a metric allows you can do calculations and report on things like *Avg. Max Scroll Percentage* along with any dimension (e.g. *Campaign Source*, *Referrer*, *Device Category*, etc.), not just page-level dimensions.
 
+**Important:** the `maxScrollTracker` plugin works best on pages whose height doesn't change once the page has loaded. It is not recommended to use `maxScrollTracker` on pages that use techniques like infinite scroll.
+
 ## Usage
 
 To enable the `maxScrollTracker` plugin, run the [`require`](https://developers.google.com/analytics/devguides/collection/analyticsjs/using-plugins) command, specify the plugin name `'maxScrollTracker'`, and pass in any configuration options (if any) you wish to set:

docs/plugins/outbound-link-tracker.md

@@ -10,6 +10,16 @@ The `outboundLinkTracker` plugin automatically detects when links are clicked to
 
 Historically, outbound link tracking has been tricky to implement because most browsers stop executing JavaScript on the current page once a link that requests a new page is clicked. The `outboundLinkTracker` plugin handles these complications for you.
 
+The following example reports show how you can use the `outboundLinkTracker` plugin to see what links users are clicking on your site:
+
+**Top outbound link clicks by URL:**
+
+![outbound-link-event-label](https://cloud.githubusercontent.com/assets/326742/22665972/bee5c654-ec6b-11e6-9d03-1cea4c936ce6.png)
+
+**Breakdown of click type for a single link:**
+
+![outbound-link-event-action](https://cloud.githubusercontent.com/assets/326742/22665973/bee64fd4-ec6b-11e6-97d3-166598d3d698.png)
+
 ## Usage
 
 To enable the `outboundLinkTracker` plugin, run the [`require`](https://developers.google.com/analytics/devguides/collection/analyticsjs/using-plugins) command, specify the plugin name `'outboundLinkTracker'`, and pass in any configuration options (if any) you wish to set:

docs/plugins/page-visibility-tracker.md

@@ -16,8 +16,12 @@ The `pageVisibilityTracker` plugin also calculates how long a given page was in
 
 The following sample reports show how you can use the `pageVisibilityTracker` plugin to more accurately measure user engagement with your content.
 
+**Top pages by visible time:**
+
 ![page-visibility-page](https://cloud.githubusercontent.com/assets/326742/22574482/e635b26a-e963-11e6-95d4-25b7face7621.png)
 
+**Traffic origins (source/medium) resulting in the longest visible sessions:**
+
 ![page-visibility-source-medium](https://cloud.githubusercontent.com/assets/326742/22574483/e636607a-e963-11e6-928a-4c49948bf8d8.png)
 
 ### How it works