Update config transform doc/comment to include skipKeepAliveWhenUnused. (#89)

Author: StephenMolloy

src/packages/CosmosDBSessionStateProviderAsync.nupkg/content/Net462/web.config.install.xdt

@@ -31,6 +31,7 @@
             maxRetryWaitTimeInSeconds: the maximum retry time in seconds for the Azure DocumentDB database service.
             consistencyLevel: The 'ConsistencyLevel' to use with the CosmosClient. Default is not-specified, leaving the choice to Cosmos SDK. (The current SDK default is 'Session'.)
             preferredLocations: sets the preferred locations(regions) for geo-replicated database accounts in the Azure DocumentDB database service. Use ';' to split multiple locations. e.g. "East US;South Central US;North Europe"
+            skipKeepAliveWhenUnused: Determines whether requests that don't touch or look at session state take the time to update the sliding expiration or not.
       -->
         <add name="CosmosDBSessionStateProviderAsync" cosmosDBEndPointSettingKey="cosmosDBEndPointSetting" cosmosDBAuthKeySettingKey="cosmosDBAuthKeySetting" databaseId="[DataBaseId]" containerId="[ContainerId]" offerThroughput="5000"
           connectionMode="Direct" requestTimeout="5" maxConnectionLimit="50" maxRetryAttemptsOnThrottledRequests="10" maxRetryWaitTimeInSeconds="10" preferredLocations=""

src/packages/SqlSessionStateProviderAsync.nupkg/content/Net462/web.config.install.xdt

@@ -16,6 +16,7 @@
                       - for compat reasons, default is 'FrameworkCompat'
 	maxRetryNumber = [integer] the number of retry when DB operation fails
 	retryInterval = [integer] intervel(milliseconds) between retries
+  skipKeepAliveWhenUnused = Determines whether requests that don't touch or look at session state take the time to update the sliding expiration or not.
       -->
         <add name="SqlSessionStateProviderAsync" connectionStringName="DefaultConnection" repositoryType="SqlServer"
           type="Microsoft.AspNet.SessionState.SqlSessionStateProviderAsync, Microsoft.AspNet.SessionState.SqlSessionStateProviderAsync, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35"