Rename BuildOnDemand to BootModuleBuilder

Author: SteveSandersonMS

src/Microsoft.AspNetCore.SpaServices.Extensions/Prerendering/SpaPrerenderingExtensions.cs

@@ -54,7 +54,7 @@ public static void UseSpaPrerendering(
             }
 
             // If we're building on demand, start that process in the background now
-            var buildOnDemandTask = options.BuildOnDemand?.Build(spaBuilder);
+            var buildOnDemandTask = options.BootModuleBuilder?.Build(spaBuilder);
 
             // Get all the necessary context info that will be used for each prerendering call
             var applicationBuilder = spaBuilder.ApplicationBuilder;

src/Microsoft.AspNetCore.SpaServices.Extensions/Prerendering/SpaPrerenderingOptions.cs

@@ -21,7 +21,7 @@ public class SpaPrerenderingOptions
         /// file automatically when the application runs. This property should be left as <c>null</c> in
         /// production applications.
         /// </summary>
-        public ISpaPrerendererBuilder BuildOnDemand { get; set; }
+        public ISpaPrerendererBuilder BootModuleBuilder { get; set; }
 
         /// <summary>
         /// Gets or sets the path, relative to your application root, of the JavaScript file