docs(PdfViewer): change overview example to live (#3137)

Author: xristianstefanov

components/pdfviewer/form-filling.md

@@ -25,7 +25,7 @@ The PDFViewer supports the following form field types:
 
 >caption Edit form fields and download the updated PDF file
 
-<demo metaUrl="client/pdfviewer/form-filling/" height="420"></demo>
+<demo metaUrl="client/pdfviewer/form-filling/" height="760"></demo>
 
 ## See Also
 

components/pdfviewer/overview.md

@@ -25,31 +25,7 @@ To use a Telerik [Blazor PDF Viewer](https://demos.telerik.com/blazor-ui/pdfview
 
 >caption Basic Blazor PDF Viewer
 
-````RAZOR
-<TelerikPdfViewer Data="@PdfSource"
-                  OnDownload="@OnPdfDownload"
-                  Height="600px">
-</TelerikPdfViewer>
-
-@code {
-    private byte[] PdfSource { get; set; }
-
-    private async Task OnPdfDownload(PdfViewerDownloadEventArgs args)
-    {
-        args.FileName = "PDF-Viewer-Download";
-    }
-
-    protected override void OnInitialized()
-    {
-        PdfSource = Convert.FromBase64String(PdfBase64);
-
-        base.OnInitialized();
-    }
-
-    private const string PdfBase64 = "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";
-}
-````
-
+<demo metaUrl="client/pdfviewer/overview/" height="400"></demo>
 
 ## Toolbar