doc: 更正预览文档链接

Author: ArgoZhang

src/BootstrapBlazor.Server/Components/Samples/FileViewers.razor.cs

@@ -25,9 +25,6 @@ protected override void OnInitialized()
         ExcelSampleFile = CombineFilename("sample.xlsx");
 
         FileList.Add("sample.xlsx");
-        FileList.Add("sample2.xlsx");
-        FileList.Add("sample3.xlsx");
-        FileList.Add("sample2.docx");
         FileList.Add("sample.docx");
         Url = FileList[0];
 

src/BootstrapBlazor.Server/Components/Samples/PdfViewers.razor

@@ -18,7 +18,7 @@
             </div>
         </div>
     </section>
-    <PdfViewer Url="./samples/pdf-viewer.pdf" Height="620px"
+    <PdfViewer Url="./samples/sample.pdf" Height="620px"
                NotSupportCallback="NotSupportCallback" OnLoaded="OnLoaded"
                UseGoogleDocs="@_useGoogleDocs"></PdfViewer>
 </DemoBlock>