intr_event.9: Remove double word

- s/of of/of/

MFC after: 3 days

Remove $FreeBSD$: two-line nroff pattern

Remove /^\.\\"\n\.\\"\s*\$FreeBSD\$$\n/

intr_event(9): fixup Nm field

intr_event(9): document intr_event_handle()

Reviewed by: pauamma
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36934

intr_event(9): update copyright

To reflect my work on the rewrite, which is in-part sponsored by
the FreeBSD Foundation.

I have also included a copyright entry for trhodes@, who wrote the patch
beg

intr_event(9): update copyright

To reflect my work on the rewrite, which is in-part sponsored by
the FreeBSD Foundation.

I have also included a copyright entry for trhodes@, who wrote the patch
beginning this rewrite in PR 100803.

Reviewed by: imp, jhb, emaste
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D36935

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intr_event(9): update existing function descriptions

Document new arguments and behaviours for these functions as compared to
the old ithread_* versions.

Reviewed by: pauamma
Input from: jhb
MFC af

intr_event(9): update existing function descriptions

Document new arguments and behaviours for these functions as compared to
the old ithread_* versions.

Reviewed by: pauamma
Input from: jhb
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33478

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intr_event(9): update top-level description

The ithread has been subsumed by the 'interrupt event' object, so
update the description to reflect this by describing an interrupt event
and its contents

intr_event(9): update top-level description

The ithread has been subsumed by the 'interrupt event' object, so
update the description to reflect this by describing an interrupt event
and its contents. We've also moved on from having a single handler
function to the split filter-and-handler model. Explain the purpose and
constraints of these two types of handlers.

Reviewed by: jhb, pauamma
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33477

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intr_event(9): update the example of swi_add()

Reviewed by: jhb
MFC after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D33476

ithread(9): update functions to current day

The public KPI is now intr_event_**,
- Convert existing documented functions to their equivalents.
- Fix up the function arguments
- Fix up the possibl

ithread(9): update functions to current day

The public KPI is now intr_event_**,
- Convert existing documented functions to their equivalents.
- Fix up the function arguments
- Fix up the possible error return values for each
- Remove ithread_schedule() completely
- Rename man page to intr_event(9)
- Update cross-references

Future changes will update the descriptive text for these functions.

PR: 100803
Based on work by: trhodes
Reviewed by: jhb
MFC after: 2 weeks
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D33475

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