The commit 16183f665e ("samples: subsys: fs: create common fs sample")
renames the sample name for FAT fs from 'fat_fs' to 'fs_sample'.
To avoid this kind of errors, ":zephyr:code-sample:`xxx`" is introduced.
Signed-off-by: Haiyue Wang <haiyuewa@163.com>
4cc76e8a9a