Improve intellisense for AddConnectionString (#2481)

* Improve intellisense for AddConnectionString

Unclear what the name will be used for, and where its located.

src/Aspire.Hosting/Extensions/ParameterResourceBuilderExtensions.cs

@@ -87,7 +87,7 @@ private static void WriteParameterResourceToManifest(ManifestPublishingContext c
     /// Adds a parameter to the distributed application but wrapped in a resource with a connection string for use with <see cref="ResourceBuilderExtensions.WithReference{TDestination}(IResourceBuilder{TDestination}, IResourceBuilder{IResourceWithConnectionString}, string?, bool)"/>
     /// </summary>
     /// <param name="builder">Distributed application builder</param>
-    /// <param name="name">Name of parameter resource</param>
+    /// <param name="name">Name of parameter resource. The value of the connection string is read from the "ConnectionStrings:{resourcename}" configuration section, for example in appsettings.json or user secrets</param>
     /// <param name="environmentVariableName">Environment variable name to set when WithReference is used.</param>
     /// <returns>Resource builder for the parameter.</returns>
     /// <exception cref="DistributedApplicationException"></exception>