Documentation/core-api: min_heap: update for variable types change

Update the documentation to reflect the change in variable types of
'nr' and 'size' from 'int' to 'size_t', ensuring consistency with
commit dec6c0aac4fc ("lib min_heap: Switch to size_t").

Signed-off-by: Yu-Chun Lin <[e-mail]>
Acked-by: Kuan-Wei Chiu <[e-mail]>
Signed-off-by: Jonathan Corbet <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

Documentation/core-api/min_heap.rst

···
 
     #define MIN_HEAP_PREALLOCATED(_type, _name, _nr)
     struct _name {
-        int nr;         /* Number of elements in the heap */
-        int size;       /* Maximum number of elements that can be held */
+        size_t nr;         /* Number of elements in the heap */
+        size_t size;       /* Maximum number of elements that can be held */
         _type *data;    /* Pointer to the heap data */
         _type preallocated[_nr];  /* Static preallocated array */
     }