kmalloc: fix comments affected by auto rename

Just VS Code things

kernel/mm/kmalloc.c

@@ -53,12 +53,12 @@ struct memblk {
 	};
 };
 
-/* overhead per allocation in bytes */
+/* overhead per memory block in bytes (the two block sizes at the beginning and end) */
 #define OVERHEAD (2 * sizeof(usize))
 /* every allocation is padded to a multiple of this */
 #define MIN_SIZE (sizeof(struct clist))
 
-/* memory blocks, sorted by increasing low_size */
+/* memory blocks, sorted by increasing size */
 static CLIST(blocks);
 
 /*
@@ -88,9 +88,9 @@ static usize grow_heap(usize num_pages);
 /**
  * @brief Add a new block at the end of the heap by downloading more RAM (`grow_heap()`, actually). */
 static struct memblk *blk_create(usize num_pages);
-/** @brief Get the usable block low_size in bytes, without flags or overhead. */
+/** @brief Get the usable block size in bytes, without flags or overhead. */
 static usize blk_get_size(struct memblk *blk);
-/** @brief Set the usable block low_size without overhead and without affecting flags. */
+/** @brief Set the usable block size without overhead and without affecting flags. */
 static void blk_set_size(struct memblk *blk, usize size);
 /** @brief Flag a block as allocated. */
 static void blk_set_alloc(struct memblk *blk);