Fix comments links on project generation

[Scorpil]

Follow up to #539 #589

Just my proposal.

I know many of you tend to agree that many users never update comments, so they may become outdated, but from my perspective it's responsibility of the user to keep comments up-to-date, and it's responsibility of the program to provide correct comments by default. So, here is my PR.

If you don't agree, just close this issue... I won't be angry, i promise. :D

[Scorpil]

Oh, and BTW, I've also corrected link in scrapy.cfg to point to scrapyd documentation (it was pointing to this page before). I think that's better, but it's your call.

[kmike]

I like this PR, but there is one issue: because of readthedocs/readthedocs.org#635 latest docs linked using version number are shown as outdated: check http://doc.scrapy.org/en/0.22/ vs http://doc.scrapy.org/en/latest/

[dangra]

the PR looks good but as @kmike pointed readthedocs/readthedocs.org#635 is a blocker IMO.

[pablohoffman]

I didn't merged this, I merged ttps://github.com/scrapy/scrapy/commit/5de6a11fda8fb51b23e25df835e which is associated with #925. No idea why github believes I merged this PR (which, btw, shows 0 commits associated)