more fixes

aspnetcore/performance/caching/response.md

@@ -35,9 +35,9 @@ The web server can cache responses by adding the response caching middleware. Se
 
 The `ResponseCacheAttribute` specifies the parameters necessary for setting appropriate headers in response caching. See [ResponseCacheAttribute](https://docs.microsoft.com/en-us/aspnet/core/api/microsoft.aspnetcore.mvc.responsecacheattribute)  for a description of the parameters.
 
-`VaryByQueryKeys string[]` (requires ASP.NET Core 1.1.0 and higher): When set, the response caching middleware will vary the stored response by the given list of query keys. The middleware will serve the stored response only if the query keys of the request matches those of the original request that generated the stored response. Setting this property without adding the middleware will throw a runtime exception. 
+`VaryByQueryKeys string[]` (requires ASP.NET Core 1.1.0 and higher): When set, the response caching middleware will vary the stored response by the given list of query keys. The middleware will serve the stored response only if the query keys of the request matches those of the original request that generated the stored response. The response caching middleware must be enabled to set the VaryByQueryKeys property, otherwise a runtime exception will be thrown.
 
-There is no corresponding HTTP header for the ``VaryByQueryKeys` property. This property is an HTTP feature handled by the response caching middleware. To set the `VaryByQueryKeys` property, the response caching middleware must be enabled.
+There is no corresponding HTTP header for the `VaryByQueryKeys` property. This property is an HTTP feature handled by the response caching middleware. The response caching middleware is required to use the `VaryByQueryKeys` property.
 
 The `ResponseCacheAttribute` is used to configure and create (via `IFilterFactory`) a `ResponseCacheFilter`. The `ResponseCacheFilter` performs the work of updating the appropriate HTTP headers and features of the response. The filter:
 

aspnetcore/performance/caching/response/sample/ResponseCacheSample.xproj

@@ -10,7 +10,6 @@
     <RootNamespace>ResponseCacheSample</RootNamespace>
     <BaseIntermediateOutputPath Condition="'$(BaseIntermediateOutputPath)'=='' ">.\obj</BaseIntermediateOutputPath>
     <OutputPath Condition="'$(OutputPath)'=='' ">.\bin\</OutputPath>
-    <TargetFrameworkVersion>v4.5.2</TargetFrameworkVersion>
   </PropertyGroup>
   <PropertyGroup>
     <SchemaVersion>2.0</SchemaVersion>