Fix a couple of spelling errors in lib/

Found with codespell.

lib/transfer.c

@@ -233,7 +233,7 @@ CURLcode Curl_fillreadbuffer(struct connectdata *conn, int bytes, int *nreadp)
 #endif /* CURL_DOES_CONVERSIONS */
 
     if((nread - hexlen) == 0)
-      /* mark this as done once this chunk is transfered */
+      /* mark this as done once this chunk is transferred */
       data->req.upload_done = TRUE;
 
     nread+=(int)strlen(endofline_native); /* for the added end of line */
@@ -2098,7 +2098,7 @@ CURLcode Curl_retry_request(struct connectdata *conn,
                                 to retry. Marking it this way should
                                 prevent i.e HTTP transfers to return
                                 error just because nothing has been
-                                transfered! */
+                                transferred! */
 
     if(data->state.proto.http->writebytecount)
       Curl_readrewind(conn);