curl: Fix spelling errors reported by Lintian

Re-apply change from commit v2.8.3~265^2~1 (Fix spelling errors
reported by Lintian, 2010-07-02) on updated upstream curl.

Utilities/cmcurl/include/curl/multi.h

@@ -209,7 +209,7 @@ CURL_EXTERN CURLMcode curl_multi_cleanup(CURLM *multi_handle);
  *          curl_multi_cleanup().
  *
  *          The 'CURLMsg' struct is meant to be very simple and only contain
- *          very basic informations. If more involved information is wanted,
+ *          very basic information. If more involved information is wanted,
  *          we will provide the particular "transfer handle" in that struct
  *          and that should/could/would be used in subsequent
  *          curl_easy_getinfo() calls (or similar). The point being that we