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doc: Remove misleading reference to brd in dax.rst

brd hasn't supported DAX for a long time but dax.rst
still suggests it as an example of how to write a DAX
supporting block driver.

Remove the reference, confuse less people.

Fixes: 7a862fbbdec6 ("brd: remove dax support")
Signed-off-by: Daniel Palmer <daniel.palmer@sony.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20250610-fixdasrstbrd20250610-v1-1-4abe3b7f381a@sony.com

authored by

Daniel Palmer and committed by
Jonathan Corbet bb39dd09 fa5a06e9

-1
-1
Documentation/filesystems/dax.rst
··· 206 206 implement direct_access. 207 207 208 208 These block devices may be used for inspiration: 209 - - brd: RAM backed block device driver 210 209 - pmem: NVDIMM persistent memory driver 211 210 212 211