jbd2: fix kernel-doc for j_transaction_overhead_buffers

Use the correct struct member name in the kernel-doc notation
to prevent a kernel-doc build warning.

include/linux/jbd2.h:1303: warning: Function parameter or struct member 'j_transaction_overhead_buffers' not described in 'journal_s'
include/linux/jbd2.h:1303: warning: Excess struct member 'j_transaction_overhead' description in 'journal_s'

Fixes: e3a00a2 ("jbd2: precompute number of transaction descriptor blocks")
Reported-by: Stephen Rothwell <[email protected]>
Closes: https://lore.kernel.org/linux-next/[email protected]/
Signed-off-by: Randy Dunlap <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Theodore Ts'o <[email protected]>

Author: rddunlap

include/linux/jbd2.h

@@ -1086,7 +1086,7 @@ struct journal_s
 	int			j_revoke_records_per_block;
 
 	/**
-	 * @j_transaction_overhead:
+	 * @j_transaction_overhead_buffers:
 	 *
 	 * Number of blocks each transaction needs for its own bookkeeping
 	 */