Update dependency-injection.md (#33563)

* Update dependency-injection.md

* Update aspnetcore/fundamentals/dependency-injection.md

Co-authored-by: Tom Dykstra <[email protected]>

---------

Co-authored-by: Tom Dykstra <[email protected]>

Author: Rick-Anderson

aspnetcore/fundamentals/dependency-injection.md

@@ -150,9 +150,9 @@ public class MyService
 
 :::code language="csharp" source="~/../AspNetCore.Docs.Samples/samples/KeyedServices9/Program.cs" highlight="6,7,12-14,39,47" id="snippet_1":::
 
-#### Keyed DI in Middleware
+#### Keyed services in Middleware
 
-Middleware supports Keyed DI in both the constructor and the `Invoke`/`InvokeAsync` method:
+Middleware supports Keyed services in both the constructor and the `Invoke`/`InvokeAsync` method:
 
 :::code language="csharp" source="~/../AspNetCore.Docs.Samples/samples/KeyedServices9/Program.cs"  id="snippet_2":::