[-mm PATCH] docs/vm: Update ZONE_DEVICE memory model documentation

[Dan Williams]

Mike notes that Sphinx needs a newline before the start of a bulleted
list, and v10 of the subsection patch set changed the subsection size
from an arch-variable 'PMD_SIZE' to a constant 2MB.

Cc: Jonathan Corbet <corbet@xxxxxxx>
Reported-by: Mike Rapoport <rppt@xxxxxxxxxxxxx>
Signed-off-by: Dan Williams <dan.j.williams@xxxxxxxxx>
---
Hi Andrew,

Another small fixup to fold on top of the subsection series. Thanks to
Mike for the build test, I also caught that the doc was out of date.

 Documentation/vm/memory-model.rst |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/vm/memory-model.rst b/Documentation/vm/memory-model.rst
index e0af47e02e78..58a12376b7df 100644
--- a/Documentation/vm/memory-model.rst
+++ b/Documentation/vm/memory-model.rst
@@ -205,10 +205,11 @@ subject to its memory ranges being exposed through the sysfs memory
 hotplug api on memory block boundaries. The implementation relies on
 this lack of user-api constraint to allow sub-section sized memory
 ranges to be specified to :c:func:`arch_add_memory`, the top-half of
-memory hotplug. Sub-section support allows for `PMD_SIZE` as the minimum
-alignment granularity for :c:func:`devm_memremap_pages`.
+memory hotplug. Sub-section support allows for 2MB as the cross-arch
+common alignment granularity for :c:func:`devm_memremap_pages`.
 
 The users of `ZONE_DEVICE` are:
+
 * pmem: Map platform persistent memory to be used as a direct-I/O target
   via DAX mappings.