fix doc comments in dart:io and collection types

sdk/lib/io/http.dart

Index: sdk/lib/io/http.dart
diff --git a/sdk/lib/io/http.dart b/sdk/lib/io/http.dart
index 7099a952be0cb578e93204bb0d283a793e3066e8..9e4e6a6b24c8bd698f1f3408fab48c629e2a4bbd 100644
--- a/sdk/lib/io/http.dart
+++ b/sdk/lib/io/http.dart
@@ -1367,7 +1367,7 @@ abstract class HttpClient {
    * The `Host` header for the request will be set to the value
    * [Uri.host]:[Uri.port] from [url]. This can be overridden through the
    * [HttpClientRequest] interface before the request is sent.  NOTE
-   * if [host] is an IP address this will still be set in the `Host`
+   * if [Uri.host] is an IP address this will still be set in the `Host`
    * header.
    *
    * For additional information on the sequence of events during an