fix nuget config spellings (#568)

ProjectTemplates/nuget.config

@@ -2,7 +2,7 @@
 <configuration>
     <config>
         <!--
-             Avoid poluting the global .Nuget cache with preview packages
+             Avoid polluting the global .Nuget cache with preview packages
              either from .NET core preview SDKs, or Microsoft.Identity.Web preview
              builds
         -->
@@ -18,16 +18,16 @@
     <packageSources>
         <add key="NuGet official package source" value="https://api.nuget.org/v3/index.json" />
 
-        <!-- Test with the latest version of MIcrosoft.Identity.Web available from the repo [built with dotnet pack] -->
+        <!-- Test with the latest version of Microsoft.Identity.Web available from the repo [built with dotnet pack] -->
         <!--<add key="Microsoft.Identity.Web from build" value="../src/Microsoft.Identity.Web/bin/Debug" />
         <add key="Microsoft.Identity.Web.UI from build" value="../src/Microsoft.Identity.Web.UI/bin/Debug" />
         <add key="Microsoft.Identity.Web.MicrosoftGraph from build" value="../src/Microsoft.Identity.Web.MicrosoftGraph/bin/Debug" />-->
 
 
-        <!-- Test with a specic version of the NuGet packages generated by the ASP.NET Core team  -->
+        <!-- Test with a specific version of the NuGet packages generated by the ASP.NET Core team  -->
         <!-- <add key="Packages from the release" value="%UserProfile%\Downloads\Packages\Packages" /> -->
 
-        <!-- Test with a specic version of the NuGet packages generated by the ASP.NET Core team  -->
+        <!-- Test with a specific version of the NuGet packages generated by the ASP.NET Core team  -->
         <!-- 
             <add key="Preview-dotnetcore-sdk" value="C:\dotnetcore\Windows_Packages\Windows_Packages\Release\Shipping" />
             <add key="dotnet5" value="https://dnceng.pkgs.visualstudio.com/public/_packaging/dotnet5/nuget/v3/index.json" />