Restore missing backtick in Buffer documentation

[joepie91]

Fixes the formatting.

[Fishrock123]

@joepie91 Could you reformat the commit message to be something like "doc: add missing backtick in buffer.markdown`? (The "doc: " bit is the important bit!)

LGTM otherwise.

[joepie91]

Hmm. I'm actually not quite sure how to do that.

Also, perhaps it'd be a good idea to add the doc: prefix to the CONTRIBUTING.md explicitly - as it only seemed to refer to code contributions, I'd decided to omit it here.

[Fishrock123]

@joepie91 No problem. If you do git commit --amend you'll be able to edit your commit message. Then you can force-push the new commit up to here, along the lines of git push origin patch-1 --force. :)

[joepie91]

Okay, should be sorted now.

[Fishrock123]

Thanks, landed in 360d0fa!