spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

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Remove misleading macros from -width arguments

Also, remove $FreeBSD$ tag from manual page examples.

MFC after: 1 week

Remove macros from the width arguments passed to Bl macros

I've not removed the Er macro from one of the lists in example.9, however,
because it seems to be doing some special kind of magic. Let's l

Remove macros from the width arguments passed to Bl macros

I've not removed the Er macro from one of the lists in example.9, however,
because it seems to be doing some special kind of magic. Let's leave it
there for now.

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Add SPDX tags to example manual pages and POSIX copyright.

Reviewed by: eadler
Approved by: mat (mentor)
Differential Revision: https://reviews.freebsd.org/D14958

Remove 'All Rights Reserved' from the collection copyright and templates.

The original Berkeley Software Distributions were made in the 1980's
and 1990's. At that time, the Buenos Ares Convention of

Remove 'All Rights Reserved' from the collection copyright and templates.

The original Berkeley Software Distributions were made in the 1980's
and 1990's. At that time, the Buenos Ares Convention of 1910 was in
force in most of the countries in the Americas. It required an
affirmative statement of rights reservation, typically using 'All
Rights Reserved.' The Regents included this phrase in their copyright
notices to invoke this treaty to ensure maximal copyright protection.

In the 1990's, Latin America coutries ratifeid the Berne Convention on
copyrights which prohibited them from requiring an affirmative
statement to reserve the rights. When Nicaragua ratified in 2000, the
Buenos Ares Convention of 1910 was effectively repealed. This made all
the 'All Rights Reserved' phrases obsolete and legal deadweight most
of the time, and certainly in the cases removed here.

Since it's no longer required, and is in fact meaningless, core has
decided to dropped it from the project's collection copyright and
sample templates. It encourages other rights holders to do the same
after consultation with their legal department.

More see https://en.wikipedia.org/wiki/Buenos_Aires_Convention for
more information.

Approved by: core@ (emaste@, jhb@)
Differential Review: https://reviews.freebsd.org/D15264

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IFC @r269962

Submitted by: Anish Gupta (akgupt3@gmail.com)

Merge head from 7/28

Sync to HEAD@r269943.

use .Mt to mark up email addresses consistently (part1)

PR: 191174
Submitted by: Franco Fichtner <franco@lastsummer.de>

- Use existing functions mtx_lock() and mtx_unlock().
- Change variable name to 'error', as this is what is mostly used for
functions that return an error.
- Add mutex(9) to the SEE ALSO section.
-

- Use existing functions mtx_lock() and mtx_unlock().
- Change variable name to 'error', as this is what is mostly used for
functions that return an error.
- Add mutex(9) to the SEE ALSO section.
- Bump the date.

I don't really like the example code. I'd prefer symmetry where possible, eg.

mtx_lock(&example_lock);
error = example(NULL, EXAMPLE_ONE);
mtx_unlock(&example_lock);
if (error != 0)
return (error);

But I'll leave it as it is for now.

Reviewed by: simon

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Move the LOCKING section to before the EXAMPLES section.
Make example locking calls in the EXAMPLES section.

Reviewed by: keramida

A few more mdoc fixes I missed in the suggestions of Ruslan.

Add a sample manpage for section 9.

Suggested by: simon
Reviewed by: ru

- Use existing functions mtx_lock() and mtx_unlock().
- Change variable name to 'error', as this is what is mostly used for
functions that return an error.
- Add mutex(9) to the SEE ALSO section.
-

- Use existing functions mtx_lock() and mtx_unlock().
- Change variable name to 'error', as this is what is mostly used for
functions that return an error.
- Add mutex(9) to the SEE ALSO section.
- Bump the date.

I don't really like the example code. I'd prefer symmetry where possible, eg.

mtx_lock(&example_lock);
error = example(NULL, EXAMPLE_ONE);
mtx_unlock(&example_lock);
if (error != 0)
return (error);

But I'll leave it as it is for now.

Reviewed by: simon

show more ...

Move the LOCKING section to before the EXAMPLES section.
Make example locking calls in the EXAMPLES section.

Reviewed by: keramida

A few more mdoc fixes I missed in the suggestions of Ruslan.

Add a sample manpage for section 9.

Suggested by: simon
Reviewed by: ru