agnivade and bradfitz godoc,blog: perform minor cleanup
- Remove a stray comment which was no longer needed. The accompanying
issue was discussed and closed.
- Combine 2 if conditions into a single if-else because
length of a slice can never be negative.
- Remove http links from golangOrgAbsLinkReplacer now that all
links have been changed to https in the blog articles.

Change-Id: I2fe2ec245b580a91760c9331e9626b367f1b6740
Run-TryBot: Brad Fitzpatrick <>
Reviewed-by: Brad Fitzpatrick <>
TryBot-Result: Gobot Gobot <>
Latest commit 327197e Apr 3, 2018