[DOCS] Adds drag & drop to Discover (#157340)

## Summary

This PR adds documentation for:

- Drag and drop from Available Fields list
- Wildcards in field searches
- All sources and matching sources in Create Data View

docs/concepts/data-views.asciidoc

@@ -40,7 +40,8 @@ image::images/discover-data-view.png[How to set the {data-source} in Discover, w
 . Give your {data-source} a name.
 
 . Start typing in the *Index pattern* field, and {kib} looks for the names of
-indices, data streams, and aliases that match your input.
+indices, data streams, and aliases that match your input. You can
+view all available sources or only the sources that the data view targets.
 +
 [role="screenshot"]
 image:management/index-patterns/images/create-data-view.png["Create data view"]

docs/discover/document-explorer.asciidoc

@@ -5,7 +5,7 @@ Fine tune your explorations by customizing *Discover* to bring out the the best
 Adjust the chart height, modify the document table, and look inside a document.
 
 [role="screenshot"]
-image:images/discover.png[A view of the Discover app]
+image::images/hello-field.png[A view of the Discover app]
 
 
 [float]

docs/user/discover.asciidoc

@@ -82,21 +82,23 @@ that shows all the documents that match your search.
 By default, the document table includes a column for the time field and a column that lists all other fields in the document.
 You’ll modify the document table to display your fields of interest.
 
-. In the sidebar, enter `ma` to in the search field to find the `manufacturer` field.
+. In the sidebar, enter `ma` in the search field to find the `manufacturer` field.
 +
 [role="screenshot"]
 image:images/discover-sidebar-available-fields.png[Fields list that displays the top five search results, width=50%]
++
+NOTE: You can use wildcards in field searches.  For example, `goe*dest` finds `geo.dest` and `geo.src.dest`.
 
 . In the *Available fields* list, click `manufacturer` to view its most popular values.
 +
 **Discover** shows the top 10 values and the number of records used to calculate those values.
 
 . Click image:images/add-icon.png[Add icon] to toggle the field into the document table.
+You can also drag the field from the *Available fields* list into the document table.
 +
 [role="screenshot"]
 image::images/discover-add-icon.png[How to add a field as a column in the table, width="50%"]
 
-
 . Find the `customer_first_name` and `customer_last_name` fields and add
 them to the document table. Your table should look similar to this:
 +
@@ -111,15 +113,19 @@ column header, and then select *Move left* or *Move right*.
 +
 * To copy the name or values in a column to the clipboard, click the column header and select the desired **Copy** option.
 +
-* For keyboard shortcuts on the document table, click
-image:images/keyboard-shortcut-icon.png[icon button for opening list of keyboard shortcuts, width=24px].
-+
 * To view more of the document table,
 click
 image:images/chart-icon.png[icon button for opening Show/Hide chart menu, width=24px]
 to open the *Chart options* menu,
 and then select *Hide chart*.
 +
+* For keyboard shortcuts on the document table, click
+image:images/keyboard-shortcut-icon.png[icon button for opening list of keyboard shortcuts, width=24px].
++
+* To set the row height to one or more lines, or automatically
+adjust the height to fit the contents, click
+image:images/row-height-icon.png[icon to open the Row height pop-up, width=24px].
++
 * To toggle the table in and out of fullscreen mode, click the fullscreen icon
 image:images/fullscreen-icon.png[icon to display the document table in fullscreen mode].
 
@@ -270,6 +276,10 @@ If a field can be {ref}/search-aggregations.html[aggregated], you can quickly
 visualize it from **Discover**.
 
 . In the sidebar, find and then click `day_of_week`.
++
+[role="screenshot"]
+image:images/discover-day-of-week.png[Top values for the day_of_week field, plus Visualize button, width=50%]
+
 
 . In the popup, click **Visualize**.
 +