Fix typo in MockClientHttpRequest Javadoc

Closes gh-34856

Signed-off-by: DongNyoung Lee <121621378+Dongnyoung@users.noreply.github.com>

Author: Dongnyoung

spring-test/src/main/java/org/springframework/mock/http/client/MockClientHttpRequest.java

@@ -105,7 +105,7 @@ public URI getURI() {
 
 	/**
 	 * Set the {@link ClientHttpResponse} to be used as the result of executing
-	 * the this request.
+	 * this request.
 	 * @see #execute()
 	 */
 	public void setResponse(ClientHttpResponse clientHttpResponse) {