Correct HttpClientHandler reference to specify a proxy for HttpClient sentence (#47110)

Use intended type name `HttpClientHandler` (erroneously referenced as `HttClientHandler`) related to ‘HttpClient` configuration in the sentence below the code snippet.

Author: trentapple

docs/core/extensions/httpclient-factory.md

@@ -221,7 +221,7 @@ An <xref:Microsoft.Extensions.DependencyInjection.IHttpClientBuilder> is returne
 
 :::code source="snippets/http/configurehandler/Program.cs" id="configurehandler":::
 
-Configuring the `HttClientHandler` lets you specify a proxy for the `HttpClient` instance among various other properties of the handler. For more information, see [Proxy per client](../../fundamentals/networking/http/httpclient.md#configure-an-http-proxy).
+Configuring the `HttpClientHandler` lets you specify a proxy for the `HttpClient` instance among various other properties of the handler. For more information, see [Proxy per client](../../fundamentals/networking/http/httpclient.md#configure-an-http-proxy).
 
 ### Additional configuration