mm: fix clean_record_shared_mapping_range kernel-doc

Turn the a), b) into an unordered ReST list and remove the unnecessary
'Note:' prefix.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Matthew Wilcox (Oracle) <[e-mail]>
Reviewed-by: Randy Dunlap <[e-mail]>
Acked-by: Mike Rapoport (IBM) <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

mm/mapping_dirty_helpers.c

···
  * @end: Pointer to the number of the last set bit in @bitmap.
  * none set. The value is modified as new bits are set by the function.
  *
- * Note: When this function returns there is no guarantee that a CPU has
+ * When this function returns there is no guarantee that a CPU has
  * not already dirtied new ptes. However it will not clean any ptes not
  * reported in the bitmap. The guarantees are as follows:
- * a) All ptes dirty when the function starts executing will end up recorded
- *    in the bitmap.
- * b) All ptes dirtied after that will either remain dirty, be recorded in the
- *    bitmap or both.
+ *
+ * * All ptes dirty when the function starts executing will end up recorded
+ *   in the bitmap.
+ * * All ptes dirtied after that will either remain dirty, be recorded in the
+ *   bitmap or both.
  *
  * If a caller needs to make sure all dirty ptes are picked up and none
  * additional are added, it first needs to write-protect the address-space