Oops! More minor code amends

Spotted some other small code typos.

Author: leekelleher

src/Our.Umbraco.Ditto/ComponentModel/Processors/Contexts/DittoChainContext.cs

@@ -64,7 +64,7 @@ public void AddRange(IEnumerable<DittoProcessorContext> contexts)
         /// <summary>
         /// Adds a processor context to the collection chain.
         /// </summary>
-        /// <param name="ctx">The processor context.</param>
+        /// <param name="context">The processor context.</param>
         public void Add(DittoProcessorContext context)
         {
             _processorContexts.AddOrUpdate(context.GetType(), context, (type, ctx) => ctx); // Don't override if already exists

tests/Our.Umbraco.Ditto.PerformanceTests/PublishedContentMapping.cs

@@ -57,7 +57,6 @@ public void MapManually()
             {
                 Id = default(int), // this.content.Id,
                 Name = default(string), // this.content.Name,
-                Item = default(string), // this.content.GetProperty("item").Value.TryConvertTo<string>().Result
                 Item = default(string) // this.content.GetProperty("item").Value.TryConvertTo<string>().Result
             };
         }