React to SetSlidingExpiration spelling fix.

src/MusicStore/Areas/Admin/Controllers/StoreManagerController.cs

@@ -68,7 +68,7 @@ namespace MusicStore.Areas.Admin.Controllers
             var album = cache.GetOrAdd(cacheId, context =>
             {
                 //Remove it from cache if not retrieved in last 10 minutes
-                context.SetSlidingExpiraiton(TimeSpan.FromMinutes(10));
+                context.SetSlidingExpiration(TimeSpan.FromMinutes(10));
                 //If this returns null how do we prevent the cache to store this. 
                 return db.Albums.Where(a => a.AlbumId == id).FirstOrDefault();
             });

src/MusicStore/Controllers/StoreController.cs

@@ -46,7 +46,7 @@ namespace MusicStore.Controllers
             var album = cache.GetOrAdd(string.Format("album_{0}", id), context =>
             {
                 //Remove it from cache if not retrieved in last 10 minutes
-                context.SetSlidingExpiraiton(TimeSpan.FromMinutes(10));
+                context.SetSlidingExpiration(TimeSpan.FromMinutes(10));
 
                 var albumData = db.Albums.Single(a => a.AlbumId == id);