Add changelog for 27.1.48

Author: silambarasani

CHANGELOG.md

@@ -2,12 +2,12 @@
 
 We are excited to announce the initial release of the **Syncfusion PowerApps Code Components** library. This version includes the following components:
 
-## Added Components
+### Added Components
 - [Grid](components/grids) `Preview`:  A powerful data grid component for displaying and manipulating tabular data.
 - [Chart](components/charts) `Preview`: An interactive charting component for visualizing data through various chart types.
 - [Schedule](components/schedule) `Preview`: A scheduling component for managing appointments and events.
 - [PdfViewer](components/pdfviewer) `Preview`: A component for viewing and interacting with PDF documents within your applications.
 - [PivotView](components/pivotview) `Preview`: A pivot table component for summarizing and analyzing data dynamically.
 
-## What's Changed
+### What's Changed
 * Initial release of the Syncfusion PowerApps Code Components library in https://github.com/syncfusion/ej2-powerapps-components/pull/1