Updates from 8.18 Discover (#807)

This PR carries forward the changes made in
elastic/kibana#214838. I'll ask for dev reviews
first in the asciidoc one, then carry the edits to this one, before
merging.

See
https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/807/explore-analyze/discover/discover-get-started#in-table-search
for the most significant change.
Rest are screenshots.

ES|QL related changes will be in a separate PR

Author: florent-leborgne

explore-analyze/discover/discover-get-started.md

@@ -140,6 +140,19 @@ For geo point fields (![Geo point field icon](../../images/kibana-geoip-icon.png
 ![Map containing documents](../../images/kibana-discover-maps.png "")
 
 
+### Find and highlight values in the table [in-table-search]
+
+Use the in-table search to find and highlight specific values beyond what's currently visible on your screen.
+
+The in-table search looks for all matching values in all results and pages currently loaded in the table. The number of results loaded depends on the [Sample size](document-explorer.md#document-explorer-sample-size). If you load more results, the search automatically updates and reflects the new number of matching values, if any more are found.
+
+```{tip}
+You can navigate between results with your keyboard by pressing "Enter" to go to the next result, and "Shift + Enter" to go to the previous result.
+```
+
+![Using the in-table search and navigating through the matches](https://images.contentstack.io/v3/assets/bltefdd0b53724fa2ce/blt30bf5f8b9a45ab74/67c234a787966d9fbc994ce0/in-table-search-demo.gif)
+
+
 ### Compare documents [compare-documents-in-discover]
 
 You can use **Discover** to compare and diff the field values of multiple results or documents in the table.
@@ -167,6 +180,10 @@ You can quickly copy the content currently displayed in the table for one or sev
 
 The content is copied to your clipboard in the selected format. Fields that are not currently added to the table are ignored.
 
+:::{tip}
+You can copy the content of a single cell to your clipboard from the quick actions that appear when hovering over the cell.
+:::
+
 
 ### Explore individual result or document details in depth [look-inside-a-document]