Document r269065, iSCSI redirection handling

Submitted by:	trasz
Sponsored by:	The FreeBSD Foundation
Document r265523, kern.iscsi.fail_on_disconnection

Submitted by:	trasz
Sponsored by:	The FreeBSD Foundation
Document r265524, iSCSI lock contention optimizations.

Submitted by:	trasz
Sponsored by:	The FreeBSD Foundation
Document r265524, iSCSI performance optimizations.

Submitted by:	trasz
Sponsored by:	The FreeBSD Foundation
Expand r262855 to illustrate how to enable the test suite.

Submitted by:	jmmv
Sponsored by:	The FreeBSD Foundation
Remove a generalized sentence regarding iSCSI updates that
should be covered by the past few commits.

Sponsored by:	The FreeBSD Foundation
Minor rewording to the r260385 entry.

Sponsored by:	The FreeBSD Foundation
Document r270892, autofs(5)

Sponsored by:	The FreeBSD Foundation
Document r270810, hptnr(4) update to 1.0.1.

Sponsored by:	The FreeBSD Foundation
Document r270997, zdb(8) included in /rescue.

Sponsored by:	The FreeBSD Foundation
Document r270890, pathchk(1): Ensure bytes >= 128 are considered
non-portable characters.

Sponsored by:	The FreeBSD Foundation
Minor rewording to the r260387 entry.

Sponsored by:	The FreeBSD Foundation