memblock: fix kernel-doc markups

Some identifiers have different names between their prototypes
and the kernel-doc markup.

Acked-by: Mike Rapoport <[e-mail]>
Signed-off-by: Mauro Carvalho Chehab <[e-mail]>
Link: https://lore.kernel.org/r/f3c65f[e-mail]
Signed-off-by: Jonathan Corbet <[e-mail]>

include/linux/memblock.h

···
 				  unsigned long *out_spfn,
 				  unsigned long *out_epfn);
 /**
- * for_each_free_mem_range_in_zone - iterate through zone specific free
+ * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free
  * memblock areas
  * @i: u64 used as loop variable
  * @zone: zone in which all of the memory blocks reside
···
 	     __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end))
 
 /**
- * for_each_free_mem_range_in_zone_from - iterate through zone specific
+ * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific
  * free memblock areas from a given point
  * @i: u64 used as loop variable
  * @zone: zone in which all of the memory blocks reside