Merge pull request #3668 from olehermanse/search_up

Added reference for search_up

Author: olehermanse

generator/_references.md

@@ -71,3 +71,4 @@
 [getpwuid()]: https://linux.die.net/man/3/getpwuid
 [getpwnam()]: https://linux.die.net/man/3/getpwnam
 [select()]: https://linux.die.net/man/3/select
+[search_up()]: /reference/functions/findfiles_up