doc: fs: fix link to mkdtemp

PR-URL: https://github.com/nodejs/node/pull/9379
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>
Reviewed-By: Prince John Wesley <princejohnwesley@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Roman Reiss <me@silverwind.io>

doc/api/fs.md

@@ -2190,7 +2190,7 @@ The following constants are meant for use with the [`fs.Stats`][] object's
 [`fs.FSWatcher`]: #fs_class_fs_fswatcher
 [`fs.futimes()`]: #fs_fs_futimes_fd_atime_mtime_callback
 [`fs.lstat()`]: #fs_fs_lstat_path_callback
-[`fs.mkdtemp()`]: #fs_fs_mkdtemp_prefix_callback
+[`fs.mkdtemp()`]: #fs_fs_mkdtemp_prefix_options_callback
 [`fs.open()`]: #fs_fs_open_path_flags_mode_callback
 [`fs.read()`]: #fs_fs_read_fd_buffer_offset_length_position_callback
 [`fs.readFile`]: #fs_fs_readfile_file_options_callback
@@ -2217,4 +2217,4 @@ The following constants are meant for use with the [`fs.Stats`][] object's
 [`event ports`]: http://illumos.org/man/port_create
 [`ReadDirectoryChangesW`]: https://msdn.microsoft.com/en-us/library/windows/desktop/aa365465%28v=vs.85%29.aspx
 [`AHAFS`]: https://www.ibm.com/developerworks/aix/library/au-aix_event_infrastructure/
-[Common System Errors]: errors.html#errors_common_system_errors
+[Common System Errors]: errors.html#errors_common_system_errors