Fixed typo in index.mdx (#3881)

Co-authored-by: Alison Joseph <[email protected]>

src/pages/data-visualization/chart-anatomy/index.mdx

@@ -134,7 +134,7 @@ a feature that we'd like to implement for all charts to enhance accessibility.
 #### Big number or KPI
 
 A key performance indicator (KPI) consists of a number with a single word
-description. Examples include “15,250 browsers”, “\$1.3M revenue”, or “Total
+description. Examples include “15,250 browsers”, “$1.3M revenue”, or “Total
 450”. A big number inside the donut chart may be used to display a total sum or
 the individual count of a slice upon interaction. This element can also be used
 independently on a dashboard (though please note this component is still a WIP