docs: update stepper quickstart equation

The "source" for the equation was correct in the asciidoc .txt file, but
the image containing the rendered equation was out of date.  The latex
equation images are not automatically generated/updated, so i did it
by hand.

Thanks to Joe Hildreth for the bug report.

For next time, these are the steps i did:

* I uncommented the relevant latex part of the asciidoc .txt file.

* I ran 'make doc' to generate the html file with the latex source in
  a pass-through block.

* I ran html-latex-images on the html file to generate the updated
  .png files.

* I overwrote the .png in git with the regenerated one from the script
  and this is the commit.
Docs: update halshow description to remove outdated blocks component

Signed-off-by: John Thornton <jthornton@gnipsel.com>
deb: fixup changelog fat-fingering

My fingers are faster than my brain.

Signed-off-by: Sebastian Kuzminsky <seb@highlab.com>
Docs: remove blocks description

Signed-off-by: John Thornton <jthornton@gnipsel.com>
Docs: change suggested values so they cover most of the drives listed on the wiki
They don't need to match the image.

Signed-off-by: John Thornton <jthornton@gnipsel.com>
docs: document some missing declarations in the comp tool
Merge remote-tracking branch 'origin/2.6'