Various style fixes (and some of VAX related errors and copy&pastos),
from Mouse on tech-install.

s/developement/development/

Modernize release notes:
- use https where possible
- adapt to cdn/nycdn and our current auto-build conventions
- automate where possible
Many thanks to uwe for lots of *roff help.

Pass the set suffix (either .tgz or .tar.xz) from the makefile.
Document the rescue set.

Fix a typo

Document debug sets and kernel module directory.

- update upgrade issues:
+ ARM ABI change
+ new users
+ new groups
- add modules set where missing
- formatting improvements
- note that rtsol{,d} will be gone in the future
- fix raw partition

- update upgrade issues:
+ ARM ABI change
+ new users
+ new groups
- add modules set where missing
- formatting improvements
- note that rtsol{,d} will be gone in the future
- fix raw partition info
- update sparc64 hardware support
- remove note about sparc SMP support being broken
- update some size requirements (still lots of ancient bogus RAM
minimums lingering -- HI PORTMASTERS!)
- various other minor content modernization
- whitespace fixes

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Update description about kernel sets etc.
(no GENERIC but IPAQ, JORNADA720, WZERO3 kernels)

Move common/contents file into MD dirs again.
I know it isn't a good thing to have many copy-and-pasted contents
(set file descriptions etc) in all MD files, but it's much more annoying
to maintain a

Move common/contents file into MD dirs again.
I know it isn't a good thing to have many copy-and-pasted contents
(set file descriptions etc) in all MD files, but it's much more annoying
to maintain a bunch of .if \n [${MACHINE}] conditionals for all ports
and maintainers rarely notice that they also have to prepare or update
MD contents in MI content file with messy ifdefs.

XXX: of course common text should be shared by mdoc macro etc.
but I doubt playing mdoc(7) is really worth...

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