Bug#1031738: installation-guide: documentation about limits to kernel boot parameters is outdated

[James Addison <jay@jp-hosting.net>]

Source: installation-guide
Followup-For: Bug #1031738

I'm attempting to rephrase the documentation related to this bug in a merge
request on Salsa:

https://salsa.debian.org/installer-team/installation-guide/-/merge_requests/24/

If anyone would like to review the suggested changes there (or even better,
test their behaviour (I've potentially made a fool of myself on lkml after
misunderstanding the difference between kernel parameters and init arguments)),
then I'd be grateful for your help.