Update repository link in header: bel2125/civetweb --> civetweb/civetweb

include/civetweb.h

@@ -80,7 +80,7 @@ struct mg_request_info {
 
 /* This structure needs to be passed to mg_start(), to let civetweb know
    which callbacks to invoke. For a detailed description, see
-   https://github.com/bel2125/civetweb/blob/master/docs/UserManual.md */
+   https://github.com/civetweb/civetweb/blob/master/docs/UserManual.md */
 struct mg_callbacks {
 	/* Called when civetweb has received new HTTP request.
 	   If the callback returns one, it must process the request
@@ -219,7 +219,7 @@ struct mg_callbacks {
      };
      struct mg_context *ctx = mg_start(&my_func, NULL, options);
 
-   Refer to https://github.com/bel2125/civetweb/blob/master/docs/UserManual.md
+   Refer to https://github.com/civetweb/civetweb/blob/master/docs/UserManual.md
    for the list of valid option and their possible values.
 
    Return: