Documentation: update notes in biovecs about arbitrarily sized bios

Update block/biovecs.txt so that it includes a note on what kind of
effects arbitrarily sized bios would bring to the block layer.
Also fix a trivial typo, bio_iter_iovec.

Cc: Christoph Hellwig <>
Cc: Kent Overstreet <>
Cc: Jonathan Corbet <>
Signed-off-by: Dongsu Park <>
Signed-off-by: Ming Lin <>
1 file changed