fix typo in basic_concepts.md (#17285)

docs/sources/guides/basic_concepts.md

@@ -66,7 +66,7 @@ There are a wide variety of styling and formatting options that each Panel expos
 
 
 Panels can be dragged and dropped and rearranged on the Dashboard. They can also be resized.
 Panels can be dragged and dropped and rearranged on the Dashboard. They can also be resized.
 
 
-There are currently four Panel types: [Graph](/reference/graph/), [Singlestat](/reference/singlestat/), [Dashlist](/reference/dashlist/), [Table](/reference/table_panel/),and [Text](/reference/text/).
+There are currently five Panel types: [Graph](/reference/graph/), [Singlestat](/reference/singlestat/), [Dashlist](/reference/dashlist/), [Table](/reference/table_panel/), and [Text](/reference/text/).
 
 
 Panels like the [Graph](/reference/graph/) panel allow you to graph as many metrics and series as you want. Other panels like [Singlestat](/reference/singlestat/) require a reduction of a single query into a single number. [Dashlist](/reference/dashlist/) and [Text](/reference/text/) are special panels that do not connect to any Data Source.
 Panels like the [Graph](/reference/graph/) panel allow you to graph as many metrics and series as you want. Other panels like [Singlestat](/reference/singlestat/) require a reduction of a single query into a single number. [Dashlist](/reference/dashlist/) and [Text](/reference/text/) are special panels that do not connect to any Data Source.