Update add-controls.md (#2559)

Noticed that screenshots are inline, which doesn't render well

Author: florent-leborgne

explore-analyze/dashboards/add-controls.md

@@ -16,14 +16,17 @@ There are three types of controls:
 
 * [**Options list**](#create-and-add-options-list-and-range-slider-controls) — Adds a dropdown that allows to filter data by selecting one or more values.
   For example, if you are using the **[Logs] Web Traffic** dashboard from the sample web logs data, you can add an options list for the `machine.os.keyword` field that allows you to display only the logs generated from `osx` and `ios` operating systems.
+
   ![Options list control for the `machine.os.keyword` field with the `osx` and `ios` options selected](/explore-analyze/images/kibana-dashboard_controlsOptionsList_8.7.0.png "title =50%")
 
 * [**Range slider**](#create-and-add-options-list-and-range-slider-controls) — Adds a slider that allows to filter the data within a specified range of values. This type of control only works with numeric fields.
   For example, if you are using the **[Logs] Web Traffic** dashboard from the sample web logs data, you can add a range slider for the `hour_of_day` field that allows you to display only the log data from 9:00AM to 5:00PM.
+
   ![Range slider control for the `hour_of_day` field with a range of `9` to `17` selected](/explore-analyze/images/kibana-dashboard_controlsRangeSlider_8.3.0.png "title =50%")
 
 * [**Time slider**](#add-time-slider-controls) — Adds a time range slider that allows to filter the data within a specified range of time, advance the time range backward and forward by a unit that you can define, and animate your change in data over the specified time range.
   For example, you are using the **[Logs] Web Traffic** dashboard from the sample web logs data, and the global time filter is **Last 7 days**. When you add the time slider, you can select the previous and next buttons to advance the time range backward or forward, and select the play button to watch how the data changes over the last 7 days.
+
   ![Time slider control for the the Last 7 days](/explore-analyze/images/dashboard_timeslidercontrol_8.17.0.gif)