Fixing all errors from original PR

Author: EduardoPires

src/Samples/AspNetCore.Jwt.Sample/RunMigration.txt

@@ -6,4 +6,4 @@ dotnet ef database update --context NetDevPackAppDbContext --project src\Samples
 Custom configuration:
 
 dotnet ef migrations add Initial --context MyIdentityContext --project src\Samples\AspNetCore.Jwt.Sample\AspNetCore.Jwt.Sample.csproj
-dotnet ef database update --context MyIdentityContext --project src\Samples\AspNetCore.Jwt.Sample\AspNetCore.Jwt.Sample.csproj
+dotnet ef database update --context MyIdentityContext --project src\Samples\AspNetCore.Jwt.Sample\AspNetCore.Jwt.Sample.csproj