[Docs] 8.18 updates for Discover (#214838)

This PR adds documentation for Discover related changes in 8.18


Rel: https://github.com/elastic/platform-docs-team/issues/614


ES|QL related changes will be in a separate PR

---------

Co-authored-by: wajihaparvez <wajiha.parvez@elastic.co>

docs/discover/document-explorer.asciidoc

@@ -61,7 +61,7 @@ When the number of results returned by your search query (displayed at the top o
 
 On the last page of the table, a message indicates that you've reached the end of the loaded search results. From that message, you can choose to load more results to continue exploring. 
 
-image:images/discover-limit-sample-size.png[Limit sample size in Discover]
+image:images/discover-limit-sample-size.png[Limit sample size in Discover, width="40%"]
 
 
 [float]

docs/discover/get-started-discover.asciidoc

@@ -167,6 +167,18 @@ your data appears in a map.
 [role="screenshot"]
 image:images/discover-maps.png[Map containing documents]
 
+[float]
+[[in-table-search]]
+==== Find and highlight values in the table
+
+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 <<document-explorer-sample-size,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.
+
+image::https://images.contentstack.io/v3/assets/bltefdd0b53724fa2ce/blt30bf5f8b9a45ab74/67c234a787966d9fbc994ce0/in-table-search-demo.gif[Using the in-table search and navigating through the matches]
+
 
 [float]
 [[compare-documents-in-discover]]
@@ -201,6 +213,8 @@ 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.
+
 [float]
 [[look-inside-a-document]]
 ==== Explore individual result or document details in depth
@@ -224,7 +238,7 @@ hover your mouse over the *Field* or *Value* columns for filters and additional
 +
 TIP: You can restrict the fields listed in the detailed view to just the fields that you explicitly added to the **Discover** table, using the **Selected only** toggle. In ES|QL mode, you also have an option to hide fields with null values.
 
-. To navigate to a view of the document that you can bookmark and share, select ** View single document**.
+. To navigate to a view of the document that you can bookmark and share, select **View single document**.
 
 . To view documents that occurred before or after the event you are looking at, select
 **View surrounding documents**.