Added Dot(.) at the end of line (#28150)

Hi - Added Dot(.) at the end of line.

Thanks,
Ashish

docs/sources/dashboards/_index.md

@@ -31,7 +31,7 @@ The image above shows you the top header for a Dashboard.
 
 1. Side menubar toggle: This toggles the side menu, allowing you to focus on the data presented in the dashboard. The side menu provides access to features unrelated to a Dashboard such as Users, Organizations, and Data Sources.
 1. Dashboard dropdown: This dropdown shows you which Dashboard you are currently viewing, and allows you to easily switch to a new Dashboard. From here you can also create a new Dashboard or folder, import existing Dashboards, and manage Dashboard playlists.
-1. Add Panel: Adds a new panel to the current Dashboard
+1. Add Panel: Adds a new panel to the current Dashboard.
 1. Star Dashboard: Star (or unstar) the current Dashboard. Starred Dashboards will show up on your own Home Dashboard by default, and are a convenient way to mark Dashboards that you're interested in.
 1. Share Dashboard: Share the current dashboard by creating a link or create a static Snapshot of it. Make sure the Dashboard is saved before sharing.
 1. Save dashboard: The current Dashboard will be saved with the current Dashboard name.