memory.h: Silence kernel-doc complaints

Fix a few instances where kernel-doc complains about doc comments
in memory.h.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

include/exec/memory.h

@@ -360,10 +360,14 @@ typedef struct IOMMUMemoryRegionClass {
 typedef struct CoalescedMemoryRange CoalescedMemoryRange;
 typedef struct MemoryRegionIoeventfd MemoryRegionIoeventfd;
 
+/** MemoryRegion:
+ *
+ * A struct representing a memory region.
+ */
 struct MemoryRegion {
     Object parent_obj;
 
-    /* All fields are private - violators will be prosecuted */
+    /* private: */
 
     /* The following fields should fit in a cache line */
     bool romd_mode;
@@ -452,7 +456,7 @@ struct MemoryListener {
  * AddressSpace: describes a mapping of addresses to #MemoryRegion objects
  */
 struct AddressSpace {
-    /* All fields are private. */
+    /* private: */
     struct rcu_head rcu;
     char *name;
     MemoryRegion *root;
@@ -1679,8 +1683,8 @@ bool memory_region_is_mapped(MemoryRegion *mr);
  *
  * Returns a #MemoryRegionSection that describes a contiguous overlap.
  * It will have the following characteristics:
- *    .@size = 0 iff no overlap was found
+ * - @size = 0 iff no overlap was found
- *    .@mr is non-%NULL iff an overlap was found
+ * - @mr is non-%NULL iff an overlap was found
  *
  * Remember that in the return value the @offset_within_region is
  * relative to the returned region (in the .@mr field), not to the
@@ -1691,8 +1695,8 @@ bool memory_region_is_mapped(MemoryRegion *mr);
  * returned one.  However, in the special case where the @mr argument
  * has no container (and thus is the root of the address space), the
  * following will hold:
- *    .@offset_within_address_space >= @addr
+ * - @offset_within_address_space >= @addr
- *    .@offset_within_address_space + .@size <= @addr + @size
+ * - @offset_within_address_space + .@size <= @addr + @size
  *
  * @mr: a MemoryRegion within which @addr is a relative address
  * @addr: start of the area within @as to be searched