netfs: fix kernel doc for nets_wait_for_outstanding_io()

The @inode parameter wasn't documented leading to new doc build
warnings.

Fixes: f89ea63f ("netfs, 9p: Fix race between umount and async request completion")
Link: https://lore.kernel.org/r/20240528133050.7e09d78e@canb.auug.org.auSigned-off-by: Christian Brauner <brauner@kernel.org>

include/linux/netfs.h

@@ -521,7 +521,7 @@ static inline struct fscache_cookie *netfs_i_cookie(struct netfs_inode *ctx)
 
 /**
  * netfs_wait_for_outstanding_io - Wait for outstanding I/O to complete
- * @ctx: The netfs inode to wait on
+ * @inode: The netfs inode to wait on
  *
  * Wait for outstanding I/O requests of any type to complete.  This is intended
  * to be called from inode eviction routines.  This makes sure that any