libcurl-http-download.md: fix typo

libcurl-http-download.md

@@ -17,7 +17,7 @@ there's the `CURLOPT_HTTPGET` option:
 
 ### Download headers too
 
-A HTTP transfer also includes a set of response headers. Reponse headers are
+A HTTP transfer also includes a set of response headers. Response headers are
 metadata associated with the actual payload, called the response body. All
 downloads will get a set of headers too, but when using libcurl you can select
 whether you want to have them downloaded (seen) or not.