IB/iser: fix typos in iscsi_iser.c comments

Fixes multiple occurrences of the misspelled word "occured" in the comments
of `iscsi_iser.c`, replacing them with the correct spelling "occurred".

This improves readability without affecting functionality.

Signed-off-by: Imanol <imvalient@protonmail.com>
Link: https://patch.msgid.link/20250217183048.9394-1-imvalient@protonmail.com


Acked-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>