Documentation: iomap: fix a typo

Change voidw -> void.

Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Link: https://lore.kernel.org/r/20240820161329.1293718-1-kernel@pankajraghav.com
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: Panky-codes

Documentation/filesystems/iomap/design.rst

@@ -165,7 +165,7 @@ structure below:
      u16                 flags;
      struct block_device *bdev;
      struct dax_device   *dax_dev;
-     voidw               *inline_data;
+     void                *inline_data;
      void                *private;
      const struct iomap_folio_ops *folio_ops;
      u64                 validity_cookie;