docs: sysctl/fs: remove references to dquot-max/-nr

dquot-max was removed in 2.4.10.5; dquot-nr was replaced with dqstats
in 2.5.18 which is now /proc/sys/fs/quota. Remove references to
dquot-max and dquot-nr in the sysctl documentation.
Signed-off-by: Stephen Kitt <steve@sk2.org>
Link: https://lore.kernel.org/r/20220930102937.135841-3-steve@sk2.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/admin-guide/sysctl/fs.rst

@@ -29,8 +29,6 @@ Currently, these files are in /proc/sys/fs:
 - aio-max-nr
 - aio-nr
 - dentry-state
-- dquot-max
-- dquot-nr
 - file-max
 - file-nr
 - inode-nr
@@ -90,20 +88,6 @@ they help speeding up rejection of non-existing files provided
 by the users.
 
 
-dquot-max & dquot-nr
---------------------
-
-The file dquot-max shows the maximum number of cached disk
-quota entries.
-
-The file dquot-nr shows the number of allocated disk quota
-entries and the number of free disk quota entries.
-
-If the number of free cached disk quotas is very low and
-you have some awesome number of simultaneous system users,
-you might want to raise the limit.
-
-
 file-max & file-nr
 ------------------