Closes #3984

Refs #3984

Refs #3984

Refs #3984

Ref 5df6f8d4

Remove an empty section left after 2d7c601b
as noticed by Dridi.

from Dridi via email

Remove boldface and XXXes which were intended to be removed before
release.

Restructured so that:

* 'Upgrading' is limited to work that has to be done to upgrade from
  a current deployment to the new version.

* 'Changes' is a comprehensive, user-level description of changes and
  new features.

Conflicts:
	doc/sphinx/whats-new/changes-trunk.rst
	doc/sphinx/whats-new/index.rst
	doc/sphinx/whats-new/upgrading-trunk.rst

before some lawyer comes along to tell us that we better have had this
to not forfeit any claims or lose entitlements.

(phk, I know your opinion about this and I hope you are right)

If you have feedback, additions or corrections, please prodive/commit
them before next Thursday, September 14, when I will continue to work on
release documentation unless someone else does it.

Signed-off-by: Asad Sajjad Ahmed <asadsa@varnish-software.com>

Ref #3946

And drop the artificial 6 digits pseudo-alignment, leading to a more
compact output when VCLs get less than 100k concurrent client tasks.

It turns out we no longer need the VSB at this point since it is
equivalent to the symbol's rname.

We don't need to since cache objects are mostly immutable and headers
are read-only in VCL.

Better diff with the --ignore-all-space option.

It is no longer supported in VCL, but strtod() will accept it.

Fixes #3971

If oc->boc is not NULL for an ObjFreeObj() call, the stevedore
needs to finish any busy object transaction.

Fixes #3953

Fixes #3952