MFC r360165:

Also update est(4) as r360162 and r360164

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

use .Mt to mark up email addresses consistently (final part)

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

mdoc: remove superfluous paragraph macros.

Fix minor whitespace issues.

est(4) man page update to document the exposed sysctl r/o variables
available to the user. Should be applicable to all branches and versions
where est(4) exists.

thanks to gjb for reviewing and suggesting nits

Reviewed by: gjb@
MFC after: 2 weeks

Correct misunderstanding of hw.est.strict

Setting strict causes a validation of the requested
value vs the value currently running after a frequency
change is requested.

Change applicability to be single core not i386.

Thanks to mav@ for reviewing and commenting on my
lack of understanding.

MFC after: 2 weeks

Remove end of line whitespace.

Minor mdoc fixes.

Document support for Intel Enhanced Speedstep Tech interface
of cpufreq(4) via a new man page est(4)

Document the two exposed tuneables of est(4).

I'd appreciate more reviews of content if possible. I gleaned
the information contained herein from sys/x86/cpufreq/est.c and
the Intel reference documentation

Reviewed by: wblock hrs gjb
MFC after: 2 weeks