doc: Minor documentation modifications

1- Add note to remove any non-relevant configuration options.
2- Rephrase text of Xen `unhandled word write` messages.
3- Remove unnecessary text in HIPC reproduce subsection.
4- Mention the safety island cluster on running ping command.
5- Update libcam version in the logs to v1.0.
6- Remove using `send esc` for Domu2 in Critical Application
   Monitoring Virtualization use case, because DomU2 is logged
   into using ssh which does not need to enter `send esc` after
   `Ctrl-]`.
7- Add generic known issue for automated validation timeouts.
8- Inform the user that the `ssl_client1` results will appear
   after a few seconds.
9- Fix invalid TF-M links.

Signed-off-by: Ziad Elhanafy <ziad.elhanafy@arm.com>