docs: admin-guide: sysctl: fix details of struct dentry_stat_t

Commit c8c0c239d5ab moved struct dentry_stat_t to fs/dcache.c but
did not update its location in Documentation, so update that now.
Also change each struct member from int to long as done in
commit 3942c07ccf98.

Fixes: c8c0c239d5ab ("fs: move dcache sysctls to its own file")
Fixes: 3942c07ccf98 ("fs: bump inode and dentry counters to long")
Signed-off-by: Randy Dunlap <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: [email protected]
Cc: Luis Chamberlain <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Glauber Costa <[email protected]>
Acked-by: Christian Brauner <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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