update docs (#74364)

docs/developer/architecture/code-exploration.asciidoc

@@ -58,9 +58,9 @@ The Charts plugin is a way to create easier integration of shared colors, themes
 WARNING: Missing README.
 
 
-- {kib-repo}blob/{branch}/src/plugins/dashboard[dashboard]
+- {kib-repo}blob/{branch}/src/plugins/dashboard/README.md[dashboard]
 
-WARNING: Missing README.
+Contains the dashboard application.
 
 
 - {kib-repo}blob/{branch}/src/plugins/data/README.md[data]
@@ -76,9 +76,9 @@ Routing will be handled by the id of the dev tool - your dev tool will be mounte
 This API doesn't support angular, for registering angular dev tools, bootstrap a local module on mount into the given HTML element.
 
 
-- {kib-repo}blob/{branch}/src/plugins/discover[discover]
+- {kib-repo}blob/{branch}/src/plugins/discover/README.md[discover]
 
-WARNING: Missing README.
+Contains the Discover application and the saved search embeddable.
 
 
 - {kib-repo}blob/{branch}/src/plugins/embeddable/README.md[embeddable]
@@ -109,9 +109,9 @@ Moves the legacy ui/registry/feature_catalogue module for registering "features"
 WARNING: Missing README.
 
 
-- {kib-repo}blob/{branch}/src/plugins/input_control_vis[inputControlVis]
+- {kib-repo}blob/{branch}/src/plugins/input_control_vis/README.md[inputControlVis]
 
-WARNING: Missing README.
+Contains the input control visualization allowing to place custom filter controls on a dashboard.
 
 
 - {kib-repo}blob/{branch}/src/plugins/inspector/README.md[inspector]
@@ -206,9 +206,10 @@ This plugin adds the Advanced Settings section for the Usage Data collection (ak
 WARNING: Missing README.
 
 
-- {kib-repo}blob/{branch}/src/plugins/timelion[timelion]
+- {kib-repo}blob/{branch}/src/plugins/timelion/README.md[timelion]
 
-WARNING: Missing README.
+Contains the deprecated timelion application. For the timelion visualization,
+which also contains the timelion APIs and backend, look at the vis_type_timelion plugin.
 
 
 - {kib-repo}blob/{branch}/src/plugins/ui_actions/README.md[uiActions]
@@ -222,59 +223,63 @@ Usage Collection allows collecting usage data for other services to consume (tel
 To integrate with the telemetry services for usage collection of your feature, there are 2 steps:
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_markdown[visTypeMarkdown]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_markdown/README.md[visTypeMarkdown]
 
-WARNING: Missing README.
+The markdown visualization that can be used to place text panels on dashboards.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_metric[visTypeMetric]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_metric/README.md[visTypeMetric]
 
-WARNING: Missing README.
+Contains the metric visualization.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_table[visTypeTable]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_table/README.md[visTypeTable]
 
-WARNING: Missing README.
+Contains the data table visualization, that allows presenting data in a simple table format.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_tagcloud[visTypeTagcloud]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_tagcloud/README.md[visTypeTagcloud]
 
-WARNING: Missing README.
+Contains the tagcloud visualization.
 
 
 - {kib-repo}blob/{branch}/src/plugins/vis_type_timelion/README.md[visTypeTimelion]
 
-If your grammar was changed in public/chain.peg you need to re-generate the static parser. You could use a grunt task:
+Contains the timelion visualization and the timelion backend.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_timeseries[visTypeTimeseries]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_timeseries/README.md[visTypeTimeseries]
 
-WARNING: Missing README.
+Contains everything around TSVB (the editor, visualizatin implementations and backends).
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_vega[visTypeVega]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_vega/README.md[visTypeVega]
 
-WARNING: Missing README.
+Contains the Vega visualization.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_vislib[visTypeVislib]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_vislib/README.md[visTypeVislib]
 
-WARNING: Missing README.
+Contains the vislib visualizations. These are the classical area/line/bar, pie, gauge/goal and
+heatmap charts.
 
 
-- {kib-repo}blob/{branch}/src/plugins/vis_type_xy[visTypeXy]
+- {kib-repo}blob/{branch}/src/plugins/vis_type_xy/README.md[visTypeXy]
 
-WARNING: Missing README.
+Contains the new xy-axis chart using the elastic-charts library, which will eventually
+replace the vislib xy-axis (bar, area, line) charts.
 
 
-- {kib-repo}blob/{branch}/src/plugins/visualizations[visualizations]
+- {kib-repo}blob/{branch}/src/plugins/visualizations/README.md[visualizations]
 
-WARNING: Missing README.
+Contains most of the visualization infrastructure, e.g. the visualization type registry or the
+visualization embeddable.
 
 
-- {kib-repo}blob/{branch}/src/plugins/visualize[visualize]
+- {kib-repo}blob/{branch}/src/plugins/visualize/README.md[visualize]
 
-WARNING: Missing README.
+Contains the visualize application which includes the listing page and the app frame,
+which will load the visualization's editor.
 
 
 [discrete]
@@ -345,19 +350,22 @@ You can run a local cluster and simulate a remote cluster within a single Kibana
 
 - {kib-repo}blob/{branch}/x-pack/plugins/dashboard_enhanced/README.md[dashboardEnhanced]
 
-- {kib-repo}blob/{branch}/x-pack/plugins/dashboard_mode[dashboardMode]
+Contains the enhancements to the OSS dashboard app.
 
-WARNING: Missing README.
+
+- {kib-repo}blob/{branch}/x-pack/plugins/dashboard_mode/README.md[dashboardMode]
+
+The deprecated dashboard only mode.
 
 
 - {kib-repo}blob/{branch}/x-pack/plugins/data_enhanced[dataEnhanced]
 
 WARNING: Missing README.
 
 
-- {kib-repo}blob/{branch}/x-pack/plugins/discover_enhanced[discoverEnhanced]
+- {kib-repo}blob/{branch}/x-pack/plugins/discover_enhanced/README.md[discoverEnhanced]
 
-WARNING: Missing README.
+Contains the enhancements to the OSS discover app.
 
 
 - {kib-repo}blob/{branch}/x-pack/plugins/embeddable_enhanced[embeddableEnhanced]