docs: fix vhost-user protocol doc

Some editorial tweaks to the doc:

Add a ref link to Memory region description and Multiple Memory region
description.

Descriptions about memory regions are merged into one line.

Add extra type(64 bits) to Log description structure fields

Fix ’s to 's

Signed-off-by: luzhixing12345 <luzhixing12345@gmail.com>
Message-Id: <20240911060400.3472-1-luzhixing12345@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

docs/interop/vhost-user.rst

@@ -167,6 +167,8 @@ A vring address description
 Note that a ring address is an IOVA if ``VIRTIO_F_IOMMU_PLATFORM`` has
 been negotiated. Otherwise it is a user address.
 
+.. _memory_region_description:
+
 Memory region description
 ^^^^^^^^^^^^^^^^^^^^^^^^^
 
@@ -180,7 +182,7 @@ Memory region description
 
 :user address: a 64-bit user address
 
-:mmap offset: 64-bit offset where region starts in the mapped memory
+:mmap offset: a 64-bit offset where region starts in the mapped memory
 
 When the ``VHOST_USER_PROTOCOL_F_XEN_MMAP`` protocol feature has been
 successfully negotiated, the memory region description contains two extra
@@ -190,7 +192,7 @@ fields at the end.
 | guest address | size | user address | mmap offset | xen mmap flags | domid |
 +---------------+------+--------------+-------------+----------------+-------+
 
-:xen mmap flags: 32-bit bit field
+:xen mmap flags: a 32-bit bit field
 
 - Bit 0 is set for Xen foreign memory mapping.
 - Bit 1 is set for Xen grant memory mapping.
@@ -211,7 +213,7 @@ Single memory region description
 
 :padding: 64-bit
 
-A region is represented by Memory region description.
+:region: region is represented by :ref:`Memory region description <memory_region_description>`.
 
 Multiple Memory regions description
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -224,7 +226,7 @@ Multiple Memory regions description
 
 :padding: 32-bit
 
-A region is represented by Memory region description.
+:regions: regions field contains 8 regions of type :ref:`Memory region description <memory_region_description>`.
 
 Log description
 ^^^^^^^^^^^^^^^
@@ -233,9 +235,9 @@ Log description
 | log size | log offset |
 +----------+------------+
 
-:log size: size of area used for logging
+:log size: a 64-bit size of area used for logging
 
-:log offset: offset from start of supplied file descriptor where
+:log offset: a 64-bit offset from start of supplied file descriptor where
              logging starts (i.e. where guest address 0 would be
              logged)
 
@@ -382,7 +384,7 @@ the kernel implementation.
 
 The communication consists of the *front-end* sending message requests and
 the *back-end* sending message replies. Most of the requests don't require
-replies. Here is a list of the ones that do:
+replies, except for the following requests:
 
 * ``VHOST_USER_GET_FEATURES``
 * ``VHOST_USER_GET_PROTOCOL_FEATURES``
@@ -1239,11 +1241,11 @@ Front-end message types
   (*a vring descriptor index for split virtqueues* vs. *vring descriptor
   indices for packed virtqueues*).
 
-  When and as long as all of a device’s vrings are stopped, it is
+  When and as long as all of a device's vrings are stopped, it is
   *suspended*, see :ref:`Suspended device state
   <suspended_device_state>`.
 
-  The request payload’s *num* field is currently reserved and must be
+  The request payload's *num* field is currently reserved and must be
   set to 0.
 
 ``VHOST_USER_SET_VRING_KICK``
@@ -1662,7 +1664,7 @@ Front-end message types
   :reply payload: ``u64``
 
   Front-end and back-end negotiate a channel over which to transfer the
-  back-end’s internal state during migration.  Either side (front-end or
+  back-end's internal state during migration.  Either side (front-end or
   back-end) may create the channel.  The nature of this channel is not
   restricted or defined in this document, but whichever side creates it
   must create a file descriptor that is provided to the respectively
@@ -1714,7 +1716,7 @@ Front-end message types
   :request payload: N/A
   :reply payload: ``u64``
 
-  After transferring the back-end’s internal state during migration (see
+  After transferring the back-end's internal state during migration (see
   the :ref:`Migrating back-end state <migrating_backend_state>`
   section), check whether the back-end was able to successfully fully
   process the state.