Update excel-library-working-with-charts.md

Need to mention supported format (xlsx only) for chartAdapter

Author: igDivya

doc/en/components/excel-library-working-with-charts.md

@@ -13,7 +13,8 @@ The Infragistics {Platform} Excel Engine's `WorksheetChart` functionality allows
 
 `sample="/excel/excel-library/working-with-charts", height="500", alt="{Platform} Working with Charts Example"`
 
-
+> [!Note]
+> The XLSX format is required. Other formats are not supported at this time.
 
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