Apply suggestions from code review

Author: dbu

CHANGELOG.md

@@ -4,7 +4,7 @@ The change log describes what is "Added", "Removed", "Changed" or "Fixed" betwee
 
 # unreleased
 
-- Marked `Http\Client\HttpClient` service as deprecated (#425).
+- Deprecated `Http\Client\HttpClient` in favor of `Psr\Http\Client\ClientInterface` (#425).
 - Added `Psr\Http\Client\ClientInterface` service (#425).
 
 # 1.27.1 - 2023-03-03

src/Resources/config/services.xml

@@ -48,7 +48,7 @@
             <factory class="Http\Discovery\HttpClientDiscovery" method="find" />
         </service>
         <service id="Http\Client\HttpClient" alias="httplug.client" public="false">
-            <deprecated />
+            <deprecated version="1.28" />
         </service>
         <service id="Psr\Http\Client\ClientInterface" alias="httplug.client" public="false" />