[DOCS] [Lens] 7.9 docs refresh (elastic#72301)

* [DOCS] Lens refresh for 7.9

* Clean up

* Review comments from Wylie

docs/visualize/lens.asciidoc

@@ -4,24 +4,22 @@
 
 beta[]
 
-*Lens* is a simple and fast way to create visualizations of your {es} data. With *Lens*, 
+*Lens* is a simple and fast way to create visualizations of your {es} data. To create visualizations, 
 you drag and drop your data fields onto the visualization builder pane, and *Lens* automatically generates 
 a visualization that best displays your data.
 
 With Lens, you can:
 
-* Explore your data in just a few clicks.
+* Use the automatically generated visualization suggestions to change the visualization type.
 
 * Create visualizations with multiple layers and indices.
 
-* Use the automatically generated visualization suggestions to change the visualization type.
-
 * Add your visualizations to dashboards and Canvas workpads.
 
-To get started with *Lens*, click a field in the data panel, then drag and drop the field on a highlighted area.
+To get started with *Lens*, select a field in the data panel, then drag and drop the field on a highlighted area.
 
 [role="screenshot"]
-image::images/lens_drag_drop.gif[]
+image::images/lens_drag_drop.gif[Drag and drop]
 
 You can incorporate many fields into your visualization, and Lens uses heuristics to decide how to apply each one to the visualization.
 
@@ -30,9 +28,9 @@ you can still configure the customization options for your visualization.
 
 [float]
 [[apply-lens-filters]]
-==== Filter the data panel fields
+==== Change the data panel fields
 
-The fields in the data panel based on your selected <<index-patterns, index pattern>>, and the <<set-time-filter,time filter>>. 
+The fields in the data panel are based on the selected <<index-patterns, index pattern>> and <<set-time-filter,time filter>>. 
 
 To change the index pattern, click it, then select a new one. The fields in the data panel automatically update.
 
@@ -46,12 +44,12 @@ To filter the fields in the data panel:
 [[view-data-summaries]]
 ==== Data summaries
 
-To help you decide exactly the data you want to display, get a quick summary of each field. The summary shows the distribution of values in the time range.
+To help you decide exactly the data you want to display, get a quick summary of each field. The summary shows the distribution of values within the selected time range.
 
 To view the field summary information, navigate to the field, then click *i*.
 
 [role="screenshot"]
-image::images/lens_data_info.png[]
+image::images/lens_data_info.png[Data summary window]
 
 [float]
 [[change-the-visualization-type]]
@@ -62,7 +60,7 @@ image::images/lens_data_info.png[]
 *Suggestions* are shortcuts to alternate visualizations that *Lens* generates for you.
 
 [role="screenshot"]
-image::images/lens_suggestions.gif[]
+image::images/lens_suggestions.gif[Visualization suggestions]
 
 If you'd like to use a visualization type that is not suggested, click the visualization type,
 then select a new one. 
@@ -78,19 +76,30 @@ still allows you to make the change.
 [[customize-operation]]
 ==== Change the aggregation and labels
 
-Lens allows some customizations of the data for each visualization.
+For each visualization, Lens allows some customizations of the data.
 
 . Click *Drop a field here* or the field name in the column.
 
-. Change the options that appear depending on the type of field.
+. Change the options that appear. Options vary depending on the type of field.
++
+[role="screenshot"]
+image::images/lens_aggregation_labels.png[Quick function options]
 
 [float]
 [[layers]]
 ==== Add layers and indices
 
-Bar, line, and area charts allow you to visualize multiple data layers and indices so that you can compare and analyze data from multiple sources.
+Area, line, and bar charts allow you to visualize multiple data layers and indices so that you can compare and analyze data from multiple sources.
+
+To add a layer, click *+*, then drag and drop the fields for the new layer. 
+
+[role="screenshot"]
+image::images/lens_layers.png[Add layers]
+
+To view a different index, click it, then select a new one.
 
-To add a layer, click *+*, then drag and drop the fields for the new layer. To view a different index, click it, then select a new one.
+[role="screenshot"]
+image::images/lens_index_pattern.png[Add index pattern]
 
 [float]
 [[lens-tutorial]]
@@ -110,8 +119,6 @@ To start, you'll need to add the <<add-sample-data, sample ecommerce data>>.
 
 Drag and drop your data onto the visualization builder pane.
 
-. Open *Lens*.
-
 . Select the *kibana_sample_data_ecommerce* index pattern.
 
 . Click image:images/time-filter-calendar.png[], then click *Last 7 days*. 
@@ -138,16 +145,19 @@ image::images/lens_tutorial_2.png[Lens tutorial]
 
 Make your visualization look exactly how you want with the customization options.
 
-. Click *Average of taxful_total_price*.
-
-.. Change the *Label* to `Sales`.
-
-. Click *Top values of category.keyword*.
+. Click *Average of taxful_total_price*, then change the *Label* to `Sales`.
++
+[role="screenshot"]
+image::images/lens_tutorial_3.1.png[Lens tutorial]
 
-.. Change *Number of values* to `10`. The visualization updates to show there are only
-six available categories.
+. Click *Top values of category.keyword*, then change *Number of values* to `10`.
++
+[role="screenshot"]
+image::images/lens_tutorial_3.2.png[Lens tutorial]
++
+The visualization updates to show there are only six available categories.
 +
-Look at the *Suggestions*. An area chart is not an option, but for sales data, a stacked area chart might be the best option.
+Look at the *Suggestions*. An area chart is not an option, but for the sales data, a stacked area chart might be the best option.
 
 . To switch the chart type, click *Stacked bar chart* in the column, then click *Stacked area* from the *Select a visualizations* window.
 +