Arvados

Lots of good wording and detail fixes. (Thanks! I like it when I'm not the only detail-nitpicker...)

• "... Crunch would immediately return the output from someone else's past tutorial run."
• Hopefully this happened to you only because you have an administrator account, or some other user shared their job with you/everyone (which currently requires real dedication, but we'll have a Share UI soon).
• We should say "could" instead of "would" and say something about "if they marked it as public". (It should be clear that everything is private by default.)
• Another equally likely reason to include that no_reuse flag is that you might want to re-run it yourself while playing with the tutorials.

• "use the HEAD of the specified branch" -- I think we should be saying "tip", not "HEAD"...?

• "{output} is connected to the {input}" seems to me less clear than "{output} should be used as the {input}".
• (And I still think the sentence "This is a dependency." just sounds like it's trying to get a bigger "teaching moment" than it deserves...)

Every other change looks like an improvement.

• Typo in "exclude_script_versions" example JSON, first comma should be a colon:
  • "exclude_script_versions", ["blacklisted_version_tag"],
• "Contents of the locator {foo}" seems a bit wrong. Is "contents of the collection located at {foo}" (or "whose locator is {foo}") too awkwardly verbose? Even "...the collection {foo}" would be grammatically sensible, I think.
• We should link to the real PuTTY home page, not the putty.org advertising/redirect site! http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html
• ...or even a direct download link to the installer, http://the.earth.li/~sgtatham/putty/latest/x86/putty-0.63-installer.exe

Other minor nitpicks/suggestions (and mostly out of scope of "updating for this sprint")
[edit: moved these things to #2505]

I've made a new push to implement your changes except the last section of out-of-scope stuff. I agree that a round of proper copyediting for stuff like that would be nice.

Looks great, I say merge. (I moved the unrelated todo's to #2505.)