minor #20474 [HttpClient] Update http_client.rst Test Examples (rickogden)

This PR was submitted for the 7.2 branch but it was merged into the 6.4 branch instead.

Discussion
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[HttpClient] Update http_client.rst Test Examples

Reordered assertSame arguments to use the conventional and consistent order to `$this->assertSame($expected, $actual);`.

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Commits
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b487d45 Update http_client.rst Test Examples

Author: javiereguiluz

http_client.rst

@@ -2233,7 +2233,7 @@ test it in a real application::
             );
             $this->assertSame($expectedRequestData, $mockResponse->getRequestOptions()['body']);
 
-            $this->assertSame($responseData, $expectedResponseData);
+            $this->assertSame($expectedResponseData, $responseData);
         }
     }
 
@@ -2266,7 +2266,7 @@ test. Then, save that information as a ``.har`` file somewhere in your applicati
             $responseData = $service->createArticle($requestData);
 
             // Assert
-            $this->assertSame($responseData, 'the expected response');
+            $this->assertSame('the expected response', $responseData);
         }
     }