doc: 更正拼写错误

Author: ArgoZhang

exclusion.dic

@@ -69,7 +69,6 @@ Goto
 elec
 ahora
 Nuget
-lastest
 bootstrapblazor
 layui
 devui

src/BootstrapBlazor/readme.md

@@ -28,7 +28,7 @@
 ## Installation Guide
 
 - Install .net core sdk [Official website](https://dotnet.microsoft.com/download?wt.mc_id=DT-MVP-5004174)
-- Install Visual Studio lastest [Official website](https://visualstudio.microsoft.com/vs/getting-started?wt.mc_id=DT-MVP-5004174)
+- Install Visual Studio latest [Official website](https://visualstudio.microsoft.com/vs/getting-started?wt.mc_id=DT-MVP-5004174)
 
 ```shell
 git clone https://github.com/dotnetcore/BootstrapBlazor.git