vlc_http: fix doxygen warnings

include/vlc_http.h:90: error: argument 'p_jar' of command @param is not found in the argument list of vlc_http_cookies_fetch(vlc_http_cookie_jar_t *jar, bool secure, const char *host, const char *path) (warning treated as error, aborting now)

    include/vlc_http.h:80: error: The following parameters of vlc_http_cookies_store(vlc_http_cookie_jar_t *jar, const char *cookie, const char *host, const char *path) are not documented:
      parameter 'host'
      parameter 'path' (warning treated as error, aborting now)

include/vlc_http.h

@@ -78,6 +78,8 @@ VLC_API void vlc_http_cookies_destroy( vlc_http_cookie_jar_t * p_jar );
  *
  * @param jar cookie jar object
  * @param cookie header field value of Set-Cookie
+ * @param host the hostname to store the cookie for
+ * @param path the name of the cookie to store
  * @return true, if the cookie was added, false otherwise
  */
 VLC_API bool vlc_http_cookies_store( vlc_http_cookie_jar_t *jar,
@@ -86,8 +88,10 @@ VLC_API bool vlc_http_cookies_store( vlc_http_cookie_jar_t *jar,
 /**
  * Returns a cookie value that match the given URL.
  *
- * @param p_jar a cookie jar
- * @param p_url the URL for which the cookies are returned
+ * @param jar a cookie jar
+ * @param secure whether a secure connexion will be used or not
+ * @param host the hostname for which the cookie was stored
+ * @param path the cookie name to fetch
  * @return A string consisting of semicolon-separated cookie NAME=VALUE pairs.
  */
 VLC_API char *vlc_http_cookies_fetch( vlc_http_cookie_jar_t *jar, bool secure,